51375513 has 16 divisors (see below), whose sum is σ = 82892160. Its totient is φ = 27630336.

The previous prime is 51375469. The next prime is 51375521. The reversal of 51375513 is 31557315.

It is not a de Polignac number, because 51375513 - 2⁹ = 51375001 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (51375523) 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, 71598 + ... + 72311.

It is an arithmetic number, because the mean of its divisors is an integer number (5180760).

Almost surely, 2^51375513 is an apocalyptic number.

It is an amenable number.

51375513 is a deficient number, since it is larger than the sum of its proper divisors (31516647).

51375513 is a wasteful number, since it uses less digits than its factorization.

51375513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143936.

The product of its digits is 7875, while the sum is 30.

The square root of 51375513 is about 7167.6713791859. The cubic root of 51375513 is about 371.7509244333.

The spelling of 51375513 in words is "fifty-one million, three hundred seventy-five thousand, five hundred thirteen".