51555556 has 12 divisors (see below), whose sum is σ = 97162492. Its totient is φ = 23794848.

The previous prime is 51555521. The next prime is 51555571. The reversal of 51555556 is 65555515.

It can be written as a sum of positive squares in 2 ways, for example, as 26214400 + 25341156 = 5120^2 + 5034^2 .

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

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, 495675 + ... + 495778.

Almost surely, 2^51555556 is an apocalyptic number.

It is an amenable number.

51555556 is a deficient number, since it is larger than the sum of its proper divisors (45606936).

51555556 is a wasteful number, since it uses less digits than its factorization.

51555556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 991470 (or 991468 counting only the distinct ones).

The product of its digits is 93750, while the sum is 37.

The square root of 51555556 is about 7180.2197737952. The cubic root of 51555556 is about 372.1846791801.

The spelling of 51555556 in words is "fifty-one million, five hundred fifty-five thousand, five hundred fifty-six".