51399315 has 24 divisors (see below), whose sum is σ = 97192368. Its totient is φ = 24920640.

The previous prime is 51399307. The next prime is 51399317.

51399315 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 51399315 - 2³ = 51399307 is a prime.

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 51399315.

It is not an unprimeable number, because it can be changed into a prime (51399317) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 51424 + ... + 52413.

It is an arithmetic number, because the mean of its divisors is an integer number (4049682).

Almost surely, 2^51399315 is an apocalyptic number.

51399315 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

51399315 is a deficient number, since it is larger than the sum of its proper divisors (45793053).

51399315 is a wasteful number, since it uses less digits than its factorization.

51399315 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103859 (or 103856 counting only the distinct ones).

The product of its digits is 18225, while the sum is 36.

The square root of 51399315 is about 7169.3315587996. The cubic root of 51399315 is about 371.8083256404.

The spelling of 51399315 in words is "fifty-one million, three hundred ninety-nine thousand, three hundred fifteen".