51516477 has 24 divisors (see below), whose sum is σ = 80289144. Its totient is φ = 31709184.

The previous prime is 51516473. The next prime is 51516497. The reversal of 51516477 is 77461515.

51516477 is a `hidden beast` number, since 5 + 1 + 5 + 1 + 647 + 7 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 18096516 + 33419961 = 4254^2 + 5781^2 .

It is not a de Polignac number, because 51516477 - 2² = 51516473 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51516473) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4933 + ... + 11285.

It is an arithmetic number, because the mean of its divisors is an integer number (3345381).

Almost surely, 2^51516477 is an apocalyptic number.

It is an amenable number.

51516477 is a deficient number, since it is larger than the sum of its proper divisors (28772667).

51516477 is a wasteful number, since it uses less digits than its factorization.

51516477 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6429 (or 6426 counting only the distinct ones).

The product of its digits is 29400, while the sum is 36.

The square root of 51516477 is about 7177.4979623822. The cubic root of 51516477 is about 372.0906170157.

It can be divided in two parts, 5151 and 6477, that added together give a triangular number (11628 = T₁₅₂).

The spelling of 51516477 in words is "fifty-one million, five hundred sixteen thousand, four hundred seventy-seven".