51515317 has 6 divisors (see below), whose sum is σ = 59926038. Its totient is φ = 44155944.

The previous prime is 51515291. The next prime is 51515351. The reversal of 51515317 is 71351515.

51515317 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 30041361 + 21473956 = 5481^2 + 4634^2 .

It is not a de Polignac number, because 51515317 - 2¹⁵ = 51482549 is a prime.

It is a super-2 number, since 2×51515317² = 5307655771220978, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51515617) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 525618 + ... + 525715.

It is an arithmetic number, because the mean of its divisors is an integer number (9987673).

Almost surely, 2^51515317 is an apocalyptic number.

It is an amenable number.

51515317 is a deficient number, since it is larger than the sum of its proper divisors (8410721).

51515317 is a wasteful number, since it uses less digits than its factorization.

51515317 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1051347 (or 1051340 counting only the distinct ones).

The product of its digits is 2625, while the sum is 28.

The square root of 51515317 is about 7177.4171538235. The cubic root of 51515317 is about 372.0878241982.

The spelling of 51515317 in words is "fifty-one million, five hundred fifteen thousand, three hundred seventeen".