51315545 has 16 divisors (see below), whose sum is σ = 63011520. Its totient is φ = 40106304.

The previous prime is 51315521. The next prime is 51315547. The reversal of 51315545 is 54551315.

51315545 = 146² + 147² + ... + 539².

It is a cyclic number.

It is not a de Polignac number, because 51315545 - 2²² = 47121241 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51315547) 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, 57674 + ... + 58556.

It is an arithmetic number, because the mean of its divisors is an integer number (3938220).

Almost surely, 2^51315545 is an apocalyptic number.

It is an amenable number.

51315545 is a deficient number, since it is larger than the sum of its proper divisors (11695975).

51315545 is a wasteful number, since it uses less digits than its factorization.

51315545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1144.

The product of its digits is 7500, while the sum is 29.

The square root of 51315545 is about 7163.4869302596. The cubic root of 51315545 is about 371.6062261932.

The spelling of 51315545 in words is "fifty-one million, three hundred fifteen thousand, five hundred forty-five".