51165257 has 24 divisors (see below), whose sum is σ = 64035360. Its totient is φ = 40385280.

The previous prime is 51165229. The next prime is 51165277. The reversal of 51165257 is 75256115.

It is not a de Polignac number, because 51165257 - 2⁸ = 51165001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51165217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 30794 + ... + 32412.

It is an arithmetic number, because the mean of its divisors is an integer number (2668140).

Almost surely, 2^51165257 is an apocalyptic number.

It is an amenable number.

51165257 is a deficient number, since it is larger than the sum of its proper divisors (12870103).

51165257 is a wasteful number, since it uses less digits than its factorization.

51165257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1673 (or 1660 counting only the distinct ones).

The product of its digits is 10500, while the sum is 32.

The square root of 51165257 is about 7152.9893750795. The cubic root of 51165257 is about 371.2430966834.

It can be divided in two parts, 5 and 1165257, that multiplied together give a palindrome (5826285).

The spelling of 51165257 in words is "fifty-one million, one hundred sixty-five thousand, two hundred fifty-seven".