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1311251681 = 5932211217
BaseRepresentation
bin100111000101000…
…0001110011100001
310101101100111011002
41032022001303201
510141140023211
6334040401345
744331312125
oct11612016341
93341314132
101311251681
11613192883
12307176255
1317b87748c
14c620d585
157a1b403b
hex4e281ce1

1311251681 has 4 divisors (see below), whose sum is σ = 1313463492. Its totient is φ = 1309039872.

The previous prime is 1311251677. The next prime is 1311251699. The reversal of 1311251681 is 1861521131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1861521131 = 17109501243.

It can be written as a sum of positive squares in 2 ways, for example, as 792141025 + 519110656 = 28145^2 + 22784^2 .

It is a cyclic number.

It is not a de Polignac number, because 1311251681 - 22 = 1311251677 is a prime.

It is a super-2 number, since 2×13112516812 = 3438761941850651522, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1311251281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1105016 + ... + 1106201.

It is an arithmetic number, because the mean of its divisors is an integer number (328365873).

Almost surely, 21311251681 is an apocalyptic number.

It is an amenable number.

1311251681 is a deficient number, since it is larger than the sum of its proper divisors (2211811).

1311251681 is an equidigital number, since it uses as much as digits as its factorization.

1311251681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2211810.

The product of its digits is 1440, while the sum is 29.

The square root of 1311251681 is about 36211.2093280520. The cubic root of 1311251681 is about 1094.5325614099.

The spelling of 1311251681 in words is "one billion, three hundred eleven million, two hundred fifty-one thousand, six hundred eighty-one".

Divisors: 1 593 2211217 1311251681