51331065 has 32 divisors (see below), whose sum is σ = 86935680. Its totient is φ = 25790976.

The previous prime is 51331051. The next prime is 51331069. The reversal of 51331065 is 56013315.

It is not a de Polignac number, because 51331065 - 2¹¹ = 51329017 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51331069) 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, 66019 + ... + 66791.

It is an arithmetic number, because the mean of its divisors is an integer number (2716740).

Almost surely, 2^51331065 is an apocalyptic number.

It is an amenable number.

51331065 is a deficient number, since it is larger than the sum of its proper divisors (35604615).

51331065 is a wasteful number, since it uses less digits than its factorization.

51331065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1033.

The product of its (nonzero) digits is 1350, while the sum is 24.

The square root of 51331065 is about 7164.5701196932. The cubic root of 51331065 is about 371.6436855848.

It can be divided in two parts, 5133 and 1065, that multiplied together give a palindrome (5466645).

The spelling of 51331065 in words is "fifty-one million, three hundred thirty-one thousand, sixty-five".