31331492 has 6 divisors (see below), whose sum is σ = 54830118. Its totient is φ = 15665744.

The previous prime is 31331441. The next prime is 31331507. The reversal of 31331492 is 29413313.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 22886656 + 8444836 = 4784^2 + 2906^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3916433 + ... + 3916440.

It is an arithmetic number, because the mean of its divisors is an integer number (9138353).

Almost surely, 2^31331492 is an apocalyptic number.

It is an amenable number.

31331492 is a deficient number, since it is larger than the sum of its proper divisors (23498626).

31331492 is a wasteful number, since it uses less digits than its factorization.

31331492 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7832877 (or 7832875 counting only the distinct ones).

The product of its digits is 1944, while the sum is 26.

The square root of 31331492 is about 5597.4540641259. The cubic root of 31331492 is about 315.2538207845.

The spelling of 31331492 in words is "thirty-one million, three hundred thirty-one thousand, four hundred ninety-two".