31807856550 has 24 divisors (see below), whose sum is σ = 78883484616. Its totient is φ = 8482095040.

The previous prime is 31807856543. The next prime is 31807856557. The reversal of 31807856550 is 5565870813.

It is an interprime number because it is at equal distance from previous prime (31807856543) and next prime (31807856557).

It is a self number, because there is not a number n which added to its sum of digits gives 31807856550.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31807856557) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 106026039 + ... + 106026338.

It is an arithmetic number, because the mean of its divisors is an integer number (3286811859).

Almost surely, 2^31807856550 is an apocalyptic number.

31807856550 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

31807856550 is an abundant number, since it is smaller than the sum of its proper divisors (47075628066).

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

31807856550 is a wasteful number, since it uses less digits than its factorization.

31807856550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 212052392 (or 212052387 counting only the distinct ones).

The product of its (nonzero) digits is 1008000, while the sum is 48.

The spelling of 31807856550 in words is "thirty-one billion, eight hundred seven million, eight hundred fifty-six thousand, five hundred fifty".