51415992 has 32 divisors (see below), whose sum is σ = 142822800. Its totient is φ = 17138592.

The previous prime is 51415981. The next prime is 51415993. The reversal of 51415992 is 29951415.

51415992 is a `hidden beast` number, since 514 + 1 + 59 + 92 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51415993) 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 7 ways as a sum of consecutive naturals, for example, 118803 + ... + 119234.

Almost surely, 2^51415992 is an apocalyptic number.

It is an amenable number.

51415992 is an abundant number, since it is smaller than the sum of its proper divisors (91406808).

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

51415992 is a wasteful number, since it uses less digits than its factorization.

51415992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 238052 (or 238042 counting only the distinct ones).

The product of its digits is 16200, while the sum is 36.

The square root of 51415992 is about 7170.4945436141. The cubic root of 51415992 is about 371.8485335494.

The spelling of 51415992 in words is "fifty-one million, four hundred fifteen thousand, nine hundred ninety-two".