31131396 has 36 divisors (see below), whose sum is σ = 79008384. Its totient is φ = 10335600.

The previous prime is 31131379. The next prime is 31131407. The reversal of 31131396 is 69313113.

It is a tau number, because it is divible by the number of its divisors (36).

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8161 + ... + 11351.

Almost surely, 2^31131396 is an apocalyptic number.

31131396 is a gapful number since it is divisible by the number (36) formed by its first and last digit.

It is an amenable number.

31131396 is an abundant number, since it is smaller than the sum of its proper divisors (47876988).

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

31131396 is a wasteful number, since it uses less digits than its factorization.

31131396 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3472 (or 3467 counting only the distinct ones).

The product of its digits is 1458, while the sum is 27.

The square root of 31131396 is about 5579.5515948865. The cubic root of 31131396 is about 314.5812728118.

The spelling of 31131396 in words is "thirty-one million, one hundred thirty-one thousand, three hundred ninety-six".