51011265 has 32 divisors (see below), whose sum is σ = 83356416. Its totient is φ = 26634240.

The previous prime is 51011243. The next prime is 51011267. The reversal of 51011265 is 56211015.

It is not a de Polignac number, because 51011265 - 2¹⁸ = 50749121 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51011267) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 211545 + ... + 211785.

It is an arithmetic number, because the mean of its divisors is an integer number (2604888).

Almost surely, 2^51011265 is an apocalyptic number.

It is an amenable number.

51011265 is a deficient number, since it is larger than the sum of its proper divisors (32345151).

51011265 is a wasteful number, since it uses less digits than its factorization.

51011265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 489.

The product of its (nonzero) digits is 300, while the sum is 21.

The square root of 51011265 is about 7142.2170927521. The cubic root of 51011265 is about 370.8702791396.

The spelling of 51011265 in words is "fifty-one million, eleven thousand, two hundred sixty-five".