31545113531 has 4 divisors (see below), whose sum is σ = 31551014064. Its totient is φ = 31539213000.

The previous prime is 31545113507. The next prime is 31545113609. The reversal of 31545113531 is 13531154513.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31545113531 is a prime.

It is a super-2 number, since 2×31545113531² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31545112531) 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, 2942240 + ... + 2952941.

It is an arithmetic number, because the mean of its divisors is an integer number (7887753516).

Almost surely, 2^31545113531 is an apocalyptic number.

31545113531 is a deficient number, since it is larger than the sum of its proper divisors (5900533).

31545113531 is an equidigital number, since it uses as much as digits as its factorization.

31545113531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5900532.

The product of its digits is 13500, while the sum is 32.

The spelling of 31545113531 in words is "thirty-one billion, five hundred forty-five million, one hundred thirteen thousand, five hundred thirty-one".