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1243121045 = 5248624209
BaseRepresentation
bin100101000011000…
…1000010110010101
310012122011002111012
41022012020112111
510021214333140
6323204222005
742543232415
oct11206102625
93178132435
101243121045
11588789271
122a839a905
1316a7117aa
14bb156645
1574207265
hex4a188595

1243121045 has 4 divisors (see below), whose sum is σ = 1491745260. Its totient is φ = 994496832.

The previous prime is 1243121041. The next prime is 1243121051. The reversal of 1243121045 is 5401213421.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 361684324 + 881436721 = 19018^2 + 29689^2 .

It is a cyclic number.

It is not a de Polignac number, because 1243121045 - 22 = 1243121041 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1243121045.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1243121041) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 124312100 + ... + 124312109.

It is an arithmetic number, because the mean of its divisors is an integer number (372936315).

Almost surely, 21243121045 is an apocalyptic number.

It is an amenable number.

1243121045 is a deficient number, since it is larger than the sum of its proper divisors (248624215).

1243121045 is an equidigital number, since it uses as much as digits as its factorization.

1243121045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 248624214.

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 1243121045 is about 35257.9217339877. The cubic root of 1243121045 is about 1075.2376745077.

Adding to 1243121045 its reverse (5401213421), we get a palindrome (6644334466).

The spelling of 1243121045 in words is "one billion, two hundred forty-three million, one hundred twenty-one thousand, forty-five".

Divisors: 1 5 248624209 1243121045