1312131531 has 8 divisors (see below), whose sum is σ = 1825574400. Its totient is φ = 836721512.

The previous prime is 1312131529. The next prime is 1312131559. The reversal of 1312131531 is 1351312131.

1312131531 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1312131531 - 2¹ = 1312131529 is a prime.

It is a super-2 number, since 2×1312131531² = 3443378309288807922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1312131498 and 1312131507.

It is not an unprimeable number, because it can be changed into a prime (1312131511) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9508131 + ... + 9508268.

It is an arithmetic number, because the mean of its divisors is an integer number (228196800).

Almost surely, 2^1312131531 is an apocalyptic number.

1312131531 is a deficient number, since it is larger than the sum of its proper divisors (513442869).

1312131531 is a wasteful number, since it uses less digits than its factorization.

1312131531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19016425.

The product of its digits is 270, while the sum is 21.

The square root of 1312131531 is about 36223.3561531783. The cubic root of 1312131531 is about 1094.7773171579. Note that the first 3 decimals are identical.

Adding to 1312131531 its reverse (1351312131), we get a palindrome (2663443662).

The spelling of 1312131531 in words is "one billion, three hundred twelve million, one hundred thirty-one thousand, five hundred thirty-one".