31897638150 has 48 divisors (see below), whose sum is σ = 90407023104. Its totient is φ = 7290888480.

The previous prime is 31897638061. The next prime is 31897638163. The reversal of 31897638150 is 5183679813.

It is a junction number, because it is equal to n+sod(n) for n = 31897638093 and 31897638102.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 15188302 + ... + 15190401.

It is an arithmetic number, because the mean of its divisors is an integer number (1883479648).

Almost surely, 2^31897638150 is an apocalyptic number.

31897638150 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

31897638150 is an abundant number, since it is smaller than the sum of its proper divisors (58509384954).

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

31897638150 is a wasteful number, since it uses less digits than its factorization.

31897638150 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30378725 (or 30378720 counting only the distinct ones).

The product of its (nonzero) digits is 1088640, while the sum is 51.

It can be divided in two parts, 3189763 and 8150, that added together give a palindrome (3197913).

The spelling of 31897638150 in words is "thirty-one billion, eight hundred ninety-seven million, six hundred thirty-eight thousand, one hundred fifty".