51556887 has 6 divisors (see below), whose sum is σ = 74471072. Its totient is φ = 34371252.

The previous prime is 51556859. The next prime is 51556919. The reversal of 51556887 is 78865515.

51556887 is a `hidden beast` number, since 5 + 1 + 5 + 568 + 87 = 666.

It is not a de Polignac number, because 51556887 - 2¹⁰ = 51555863 is a prime.

It is a super-2 number, since 2×51556887² = 5316225194261538, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51556807) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2864263 + ... + 2864280.

Almost surely, 2^51556887 is an apocalyptic number.

51556887 is a deficient number, since it is larger than the sum of its proper divisors (22914185).

51556887 is a wasteful number, since it uses less digits than its factorization.

51556887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5728549 (or 5728546 counting only the distinct ones).

The product of its digits is 336000, while the sum is 45.

The square root of 51556887 is about 7180.3124583823. The cubic root of 51556887 is about 372.1878820262.

The spelling of 51556887 in words is "fifty-one million, five hundred fifty-six thousand, eight hundred eighty-seven".