51520617 has 28 divisors (see below), whose sum is σ = 79942020. Its totient is φ = 33149088.

The previous prime is 51520583. The next prime is 51520627. The reversal of 51520617 is 71602515.

It can be written as a sum of positive squares in 2 ways, for example, as 39576681 + 11943936 = 6291^2 + 3456^2 .

It is not a de Polignac number, because 51520617 - 2¹⁰ = 51519593 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51520627) by changing a digit.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 19923 + ... + 22359.

Almost surely, 2^51520617 is an apocalyptic number.

It is an amenable number.

51520617 is a deficient number, since it is larger than the sum of its proper divisors (28421403).

51520617 is an equidigital number, since it uses as much as digits as its factorization.

51520617 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2484 (or 2469 counting only the distinct ones).

The product of its (nonzero) digits is 2100, while the sum is 27.

The square root of 51520617 is about 7177.7863579240. The cubic root of 51520617 is about 372.1005841432.

The spelling of 51520617 in words is "fifty-one million, five hundred twenty thousand, six hundred seventeen".