51115265 has 4 divisors (see below), whose sum is σ = 61338324. Its totient is φ = 40892208.

The previous prime is 51115247. The next prime is 51115271. The reversal of 51115265 is 56251115.

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

It can be written as a sum of positive squares in 2 ways, for example, as 8904256 + 42211009 = 2984^2 + 6497^2 .

It is a cyclic number.

It is not a de Polignac number, because 51115265 - 2¹⁰ = 51114241 is a prime.

It is a super-2 number, since 2×51115265² = 5225540632040450, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5111522 + ... + 5111531.

It is an arithmetic number, because the mean of its divisors is an integer number (15334581).

Almost surely, 2^51115265 is an apocalyptic number.

It is an amenable number.

51115265 is a deficient number, since it is larger than the sum of its proper divisors (10223059).

51115265 is a wasteful number, since it uses less digits than its factorization.

51115265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10223058.

The product of its digits is 1500, while the sum is 26.

The square root of 51115265 is about 7149.4940380421. The cubic root of 51115265 is about 371.1221472097.

The spelling of 51115265 in words is "fifty-one million, one hundred fifteen thousand, two hundred sixty-five".