31189012 has 24 divisors (see below), whose sum is σ = 58173696. Its totient is φ = 14597088.

The previous prime is 31188991. The next prime is 31189019. The reversal of 31189012 is 21098113.

It is a super-2 number, since 2×31189012² = 1945508939072288, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31189019) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 718 + ... + 7930.

It is an arithmetic number, because the mean of its divisors is an integer number (2423904).

Almost surely, 2^31189012 is an apocalyptic number.

It is an amenable number.

31189012 is a deficient number, since it is larger than the sum of its proper divisors (26984684).

31189012 is a wasteful number, since it uses less digits than its factorization.

31189012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7287 (or 7285 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 25.

The square root of 31189012 is about 5584.7123471133. The cubic root of 31189012 is about 314.7752221892.

The spelling of 31189012 in words is "thirty-one million, one hundred eighty-nine thousand, twelve".