31155012 has 36 divisors (see below), whose sum is σ = 90004096. Its totient is φ = 8901360.

The previous prime is 31155011. The next prime is 31155017. The reversal of 31155012 is 21055113.

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

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (31155011) 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 11 ways as a sum of consecutive naturals, for example, 61564 + ... + 62067.

Almost surely, 2^31155012 is an apocalyptic number.

It is an amenable number.

31155012 is an abundant number, since it is smaller than the sum of its proper divisors (58849084).

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

31155012 is a wasteful number, since it uses less digits than its factorization.

31155012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123648 (or 123643 counting only the distinct ones).

The product of its (nonzero) digits is 150, while the sum is 18.

The square root of 31155012 is about 5581.6674927839. The cubic root of 31155012 is about 314.6607988907.

The spelling of 31155012 in words is "thirty-one million, one hundred fifty-five thousand, twelve".