1312123131 has 40 divisors (see below), whose sum is σ = 2158415424. Its totient is φ = 787736880.

The previous prime is 1312123093. The next prime is 1312123139. The reversal of 1312123131 is 1313212131.

It is not a de Polignac number, because 1312123131 - 2¹⁸ = 1311860987 is a prime.

It is a super-2 number, since 2×1312123131² = 3443334221810486322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1312123139) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 88456 + ... + 102218.

Almost surely, 2^1312123131 is an apocalyptic number.

1312123131 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1312123131 is a deficient number, since it is larger than the sum of its proper divisors (846292293).

1312123131 is a wasteful number, since it uses less digits than its factorization.

1312123131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13893 (or 13884 counting only the distinct ones).

The product of its digits is 108, while the sum is 18.

The square root of 1312123131 is about 36223.2402057022. The cubic root of 1312123131 is about 1094.7749809721.

Adding to 1312123131 its reverse (1313212131), we get a palindrome (2625335262).

The spelling of 1312123131 in words is "one billion, three hundred twelve million, one hundred twenty-three thousand, one hundred thirty-one".