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1311201321 = 3437067107
BaseRepresentation
bin100111000100111…
…0101100000101001
310101101020221001220
41032021311200221
510141131420241
6334035332253
744331012243
oct11611654051
93341227056
101311201321
11613158a61
12307151089
1317b85a591
14c61d9093
157a1a4166
hex4e275829

1311201321 has 4 divisors (see below), whose sum is σ = 1748268432. Its totient is φ = 874134212.

The previous prime is 1311201299. The next prime is 1311201329. The reversal of 1311201321 is 1231021131.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1231021131 = 3410340377.

It is a cyclic number.

It is not a de Polignac number, because 1311201321 - 215 = 1311168553 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1311201321.

It is not an unprimeable number, because it can be changed into a prime (1311201329) 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, 218533551 + ... + 218533556.

It is an arithmetic number, because the mean of its divisors is an integer number (437067108).

Almost surely, 21311201321 is an apocalyptic number.

It is an amenable number.

1311201321 is a deficient number, since it is larger than the sum of its proper divisors (437067111).

1311201321 is an equidigital number, since it uses as much as digits as its factorization.

1311201321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 437067110.

The product of its (nonzero) digits is 36, while the sum is 15.

The square root of 1311201321 is about 36210.5139565845. The cubic root of 1311201321 is about 1094.5185490057.

Adding to 1311201321 its reverse (1231021131), we get a palindrome (2542222452).

The spelling of 1311201321 in words is "one billion, three hundred eleven million, two hundred one thousand, three hundred twenty-one".

Divisors: 1 3 437067107 1311201321