51213912 has 32 divisors (see below), whose sum is σ = 128228400. Its totient is φ = 17045504.

The previous prime is 51213907. The next prime is 51213919. The reversal of 51213912 is 21931215.

51213912 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51213919) 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, 21148 + ... + 23444.

Almost surely, 2^51213912 is an apocalyptic number.

It is an amenable number.

51213912 is an abundant number, since it is smaller than the sum of its proper divisors (77014488).

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

51213912 is a wasteful number, since it uses less digits than its factorization.

51213912 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3235 (or 3231 counting only the distinct ones).

The product of its digits is 540, while the sum is 24.

The square root of 51213912 is about 7156.3895925250. The cubic root of 51213912 is about 371.3607358224.

It can be divided in two parts, 51213 and 912, that added together give a palindrome (52125).

The spelling of 51213912 in words is "fifty-one million, two hundred thirteen thousand, nine hundred twelve".