51816015 has 24 divisors (see below), whose sum is σ = 89985168. Its totient is φ = 27582720.

The previous prime is 51815999. The next prime is 51816019. The reversal of 51816015 is 51061815.

51816015 is a `hidden beast` number, since 51 + 8 + 1 + 601 + 5 = 666.

It is not a de Polignac number, because 51816015 - 2⁴ = 51815999 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 51816015.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51816019) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 38992 + ... + 40298.

It is an arithmetic number, because the mean of its divisors is an integer number (3749382).

Almost surely, 2^51816015 is an apocalyptic number.

51816015 is a deficient number, since it is larger than the sum of its proper divisors (38169153).

51816015 is a wasteful number, since it uses less digits than its factorization.

51816015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2199 (or 2196 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 27.

The square root of 51816015 is about 7198.3341822952. The cubic root of 51816015 is about 372.8103864641.

The spelling of 51816015 in words is "fifty-one million, eight hundred sixteen thousand, fifteen".