51987115 has 4 divisors (see below), whose sum is σ = 62384544. Its totient is φ = 41589688.

The previous prime is 51987113. The next prime is 51987121. The reversal of 51987115 is 51178915.

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

It is a cyclic number.

It is not a de Polignac number, because 51987115 - 2¹ = 51987113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51987113) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5198707 + ... + 5198716.

It is an arithmetic number, because the mean of its divisors is an integer number (15596136).

Almost surely, 2^51987115 is an apocalyptic number.

51987115 is a deficient number, since it is larger than the sum of its proper divisors (10397429).

51987115 is a wasteful number, since it uses less digits than its factorization.

51987115 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10397428.

The product of its digits is 12600, while the sum is 37.

The square root of 51987115 is about 7210.2090815732. The cubic root of 51987115 is about 373.2202840284.

The spelling of 51987115 in words is "fifty-one million, nine hundred eighty-seven thousand, one hundred fifteen".