31131330208 has 48 divisors (see below), whose sum is σ = 69768651456. Its totient is φ = 13535357440.

The previous prime is 31131330133. The next prime is 31131330221. The reversal of 31131330208 is 80203313113.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1914541 + ... + 1930732.

It is an arithmetic number, because the mean of its divisors is an integer number (1453513572).

Almost surely, 2^31131330208 is an apocalyptic number.

It is an amenable number.

31131330208 is an abundant number, since it is smaller than the sum of its proper divisors (38637321248).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31131330208 is a wasteful number, since it uses less digits than its factorization.

31131330208 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3845317 (or 3845309 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 25.

The spelling of 31131330208 in words is "thirty-one billion, one hundred thirty-one million, three hundred thirty thousand, two hundred eight".