51555612 has 24 divisors (see below), whose sum is σ = 120684816. Its totient is φ = 17129728.

The previous prime is 51555601. The next prime is 51555613. The reversal of 51555612 is 21655515.

It is a super-2 number, since 2×51555612² = 5315962257389088, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 51555612.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51555613) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2973 + ... + 10580.

It is an arithmetic number, because the mean of its divisors is an integer number (5028534).

Almost surely, 2^51555612 is an apocalyptic number.

It is an amenable number.

51555612 is an abundant number, since it is smaller than the sum of its proper divisors (69129204).

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

51555612 is a wasteful number, since it uses less digits than its factorization.

51555612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13877 (or 13875 counting only the distinct ones).

The product of its digits is 7500, while the sum is 30.

The square root of 51555612 is about 7180.2236733963. The cubic root of 51555612 is about 372.1848139365.

The spelling of 51555612 in words is "fifty-one million, five hundred fifty-five thousand, six hundred twelve".