1312387131 has 16 divisors (see below), whose sum is σ = 2021217408. Its totient is φ = 748598400.

The previous prime is 1312387127. The next prime is 1312387159. The reversal of 1312387131 is 1317832131.

It is not a de Polignac number, because 1312387131 - 2² = 1312387127 is a prime.

It is a super-2 number, since 2×1312387131² = 3444719963228822322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1312387121) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1169125 + ... + 1170246.

It is an arithmetic number, because the mean of its divisors is an integer number (126326088).

Almost surely, 2^1312387131 is an apocalyptic number.

1312387131 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1312387131 is a deficient number, since it is larger than the sum of its proper divisors (708830277).

1312387131 is a wasteful number, since it uses less digits than its factorization.

1312387131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2339402.

The product of its digits is 3024, while the sum is 30.

The square root of 1312387131 is about 36226.8840917902. The cubic root of 1312387131 is about 1094.8483991868.

The spelling of 1312387131 in words is "one billion, three hundred twelve million, three hundred eighty-seven thousand, one hundred thirty-one".