31331012 has 12 divisors (see below), whose sum is σ = 55004460. Its totient is φ = 15615456.

The previous prime is 31330993. The next prime is 31331023. The reversal of 31331012 is 21013313.

It can be written as a sum of positive squares in 2 ways, for example, as 10023556 + 21307456 = 3166^2 + 4616^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11087 + ... + 13622.

It is an arithmetic number, because the mean of its divisors is an integer number (4583705).

It is a self-describing number.

Almost surely, 2^31331012 is an apocalyptic number.

It is an amenable number.

31331012 is a deficient number, since it is larger than the sum of its proper divisors (23673448).

31331012 is a wasteful number, since it uses less digits than its factorization.

31331012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25030 (or 25028 counting only the distinct ones).

The product of its (nonzero) digits is 54, while the sum is 14.

The square root of 31331012 is about 5597.4111873258. The cubic root of 31331012 is about 315.2522108749.

Adding to 31331012 its reverse (21013313), we get a palindrome (52344325).

The spelling of 31331012 in words is "thirty-one million, three hundred thirty-one thousand, twelve".