30931689511 has 4 divisors (see below), whose sum is σ = 30933456624. Its totient is φ = 30929922400.

The previous prime is 30931689493. The next prime is 30931689553. The reversal of 30931689511 is 11598613903.

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-30931689511 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30931689571) 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, 857035 + ... + 892396.

It is an arithmetic number, because the mean of its divisors is an integer number (7733364156).

Almost surely, 2^30931689511 is an apocalyptic number.

30931689511 is a deficient number, since it is larger than the sum of its proper divisors (1767113).

30931689511 is a wasteful number, since it uses less digits than its factorization.

30931689511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1767112.

The product of its (nonzero) digits is 174960, while the sum is 46.

The spelling of 30931689511 in words is "thirty billion, nine hundred thirty-one million, six hundred eighty-nine thousand, five hundred eleven".