31817049816 has 32 divisors (see below), whose sum is σ = 83001000960. Its totient is φ = 10144566432.

The previous prime is 31817049787. The next prime is 31817049881. The reversal of 31817049816 is 61894071813.

It is a congruent number.

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, 28819240 + ... + 28820343.

It is an arithmetic number, because the mean of its divisors is an integer number (2593781280).

Almost surely, 2^31817049816 is an apocalyptic number.

It is an amenable number.

31817049816 is an abundant number, since it is smaller than the sum of its proper divisors (51183951144).

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

31817049816 is a wasteful number, since it uses less digits than its factorization.

31817049816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57639615 (or 57639611 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 48.

The spelling of 31817049816 in words is "thirty-one billion, eight hundred seventeen million, forty-nine thousand, eight hundred sixteen".