31138732571 has 16 divisors (see below), whose sum is σ = 32342997600. Its totient is φ = 29943395328.

The previous prime is 31138732549. The next prime is 31138732577. The reversal of 31138732571 is 17523783113.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31138732571 is a prime.

It is a super-2 number, since 2×31138732571² (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 (31138732577) 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, 12661940 + ... + 12664398.

It is an arithmetic number, because the mean of its divisors is an integer number (2021437350).

Almost surely, 2^31138732571 is an apocalyptic number.

31138732571 is a deficient number, since it is larger than the sum of its proper divisors (1204265029).

31138732571 is a wasteful number, since it uses less digits than its factorization.

31138732571 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4078.

The product of its digits is 105840, while the sum is 41.

The spelling of 31138732571 in words is "thirty-one billion, one hundred thirty-eight million, seven hundred thirty-two thousand, five hundred seventy-one".