51165615 has 16 divisors (see below), whose sum is σ = 82342368. Its totient is φ = 27129216.

The previous prime is 51165607. The next prime is 51165619. The reversal of 51165615 is 51656115.

It is not a de Polignac number, because 51165615 - 2³ = 51165607 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51165619) 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, 7264 + ... + 12453.

It is an arithmetic number, because the mean of its divisors is an integer number (5146398).

Almost surely, 2^51165615 is an apocalyptic number.

51165615 is a deficient number, since it is larger than the sum of its proper divisors (31176753).

51165615 is a wasteful number, since it uses less digits than its factorization.

51165615 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19898.

The product of its digits is 4500, while the sum is 30.

The square root of 51165615 is about 7153.0143995381. The cubic root of 51165615 is about 371.2439625360.

It can be divided in two parts, 5116 and 5615, that added together give a triangular number (10731 = T₁₄₆).

The spelling of 51165615 in words is "fifty-one million, one hundred sixty-five thousand, six hundred fifteen".