31351896 has 48 divisors (see below), whose sum is σ = 86121360. Its totient is φ = 10301760.

The previous prime is 31351889. The next prime is 31351907. The reversal of 31351896 is 69815313.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 31351896.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2046 + ... + 8178.

It is an arithmetic number, because the mean of its divisors is an integer number (1794195).

Almost surely, 2^31351896 is an apocalyptic number.

31351896 is a gapful number since it is divisible by the number (36) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31351896, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43060680).

31351896 is an abundant number, since it is smaller than the sum of its proper divisors (54769464).

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

31351896 is a wasteful number, since it uses less digits than its factorization.

31351896 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6216 (or 6209 counting only the distinct ones).

The product of its digits is 19440, while the sum is 36.

The square root of 31351896 is about 5599.2763818194. The cubic root of 31351896 is about 315.3222401577.

The spelling of 31351896 in words is "thirty-one million, three hundred fifty-one thousand, eight hundred ninety-six".