51978877 has 4 divisors (see below), whose sum is σ = 55036476. Its totient is φ = 48921280.

The previous prime is 51978869. The next prime is 51978923. The reversal of 51978877 is 77887915.

51978877 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 41809156 + 10169721 = 6466^2 + 3189^2 .

It is a cyclic number.

It is not a de Polignac number, because 51978877 - 2³ = 51978869 is a prime.

It is a super-2 number, since 2×51978877² = 5403607308362258, 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 (51978677) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1528774 + ... + 1528807.

It is an arithmetic number, because the mean of its divisors is an integer number (13759119).

Almost surely, 2^51978877 is an apocalyptic number.

It is an amenable number.

51978877 is a deficient number, since it is larger than the sum of its proper divisors (3057599).

51978877 is a wasteful number, since it uses less digits than its factorization.

51978877 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3057598.

The product of its digits is 987840, while the sum is 52.

The square root of 51978877 is about 7209.6377856311. The cubic root of 51978877 is about 373.2005692003.

The spelling of 51978877 in words is "fifty-one million, nine hundred seventy-eight thousand, eight hundred seventy-seven".