30891931208 has 32 divisors (see below), whose sum is σ = 61696857600. Its totient is φ = 14450318592.

The previous prime is 30891931171. The next prime is 30891931237. The reversal of 30891931208 is 80213919803.

It is a super-2 number, since 2×30891931208² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 657368 + ... + 702791.

It is an arithmetic number, because the mean of its divisors is an integer number (1928026800).

Almost surely, 2^30891931208 is an apocalyptic number.

It is an amenable number.

30891931208 is a deficient number, since it is larger than the sum of its proper divisors (30804926392).

30891931208 is a wasteful number, since it uses less digits than its factorization.

30891931208 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1360349 (or 1360345 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 44.

The spelling of 30891931208 in words is "thirty billion, eight hundred ninety-one million, nine hundred thirty-one thousand, two hundred eight".