51632861 has 16 divisors (see below), whose sum is σ = 64819200. Its totient is φ = 40102128.

The previous prime is 51632857. The next prime is 51632873. The reversal of 51632861 is 16823615.

51632861 = 229² + 230² + ... + 550².

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 51632861 - 2² = 51632857 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51632831) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5381 + ... + 11498.

It is an arithmetic number, because the mean of its divisors is an integer number (4051200).

Almost surely, 2^51632861 is an apocalyptic number.

It is an amenable number.

51632861 is a deficient number, since it is larger than the sum of its proper divisors (13186339).

51632861 is a wasteful number, since it uses less digits than its factorization.

51632861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16928.

The product of its digits is 8640, while the sum is 32.

The square root of 51632861 is about 7185.6009491204. The cubic root of 51632861 is about 372.3706104370.

The spelling of 51632861 in words is "fifty-one million, six hundred thirty-two thousand, eight hundred sixty-one".