51245556 has 12 divisors (see below), whose sum is σ = 119572992. Its totient is φ = 17081848.

The previous prime is 51245539. The next prime is 51245561. The reversal of 51245556 is 65554215.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×51245556² = 5252214019498272, which contains 22 as substring.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors.

It is a congruent number.

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, 2135220 + ... + 2135243.

It is an arithmetic number, because the mean of its divisors is an integer number (9964416).

Almost surely, 2^51245556 is an apocalyptic number.

It is an amenable number.

51245556 is an abundant number, since it is smaller than the sum of its proper divisors (68327436).

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

51245556 is a wasteful number, since it uses less digits than its factorization.

51245556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4270470 (or 4270468 counting only the distinct ones).

The product of its digits is 30000, while the sum is 33.

The square root of 51245556 is about 7158.6001424860. The cubic root of 51245556 is about 371.4372054065.

The spelling of 51245556 in words is "fifty-one million, two hundred forty-five thousand, five hundred fifty-six".