51912987 has 16 divisors (see below), whose sum is σ = 81834240. Its totient is φ = 28641312.

The previous prime is 51912977. The next prime is 51912989. The reversal of 51912987 is 78921915.

It is not a de Polignac number, because 51912987 - 2⁶ = 51912923 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51912989) 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, 42013 + ... + 43230.

It is an arithmetic number, because the mean of its divisors is an integer number (5114640).

Almost surely, 2^51912987 is an apocalyptic number.

51912987 is a deficient number, since it is larger than the sum of its proper divisors (29921253).

51912987 is a wasteful number, since it uses less digits than its factorization.

51912987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85282.

The product of its digits is 45360, while the sum is 42.

The square root of 51912987 is about 7205.0667588857. The cubic root of 51912987 is about 373.0428090698.

The spelling of 51912987 in words is "fifty-one million, nine hundred twelve thousand, nine hundred eighty-seven".