31138667216 has 40 divisors (see below), whose sum is σ = 62339462400. Its totient is φ = 15052066560.

The previous prime is 31138667177. The next prime is 31138667257. The reversal of 31138667216 is 61276683113.

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, 474620 + ... + 536228.

It is an arithmetic number, because the mean of its divisors is an integer number (1558486560).

Almost surely, 2^31138667216 is an apocalyptic number.

It is an amenable number.

31138667216 is an abundant number, since it is smaller than the sum of its proper divisors (31200795184).

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

31138667216 is a wasteful number, since it uses less digits than its factorization.

31138667216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62667 (or 62661 counting only the distinct ones).

The product of its digits is 217728, while the sum is 44.

The spelling of 31138667216 in words is "thirty-one billion, one hundred thirty-eight million, six hundred sixty-seven thousand, two hundred sixteen".