51520005 has 12 divisors (see below), whose sum is σ = 89301420. Its totient is φ = 27477312.

The previous prime is 51520003. The next prime is 51520033. The reversal of 51520005 is 50002515.

It can be written as a sum of positive squares in 2 ways, for example, as 37970244 + 13549761 = 6162^2 + 3681^2 .

It is not a de Polignac number, because 51520005 - 2¹ = 51520003 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 51520005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51520003) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 572400 + ... + 572489.

It is an arithmetic number, because the mean of its divisors is an integer number (7441785).

Almost surely, 2^51520005 is an apocalyptic number.

It is an amenable number.

51520005 is a deficient number, since it is larger than the sum of its proper divisors (37781415).

51520005 is a wasteful number, since it uses less digits than its factorization.

51520005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1144900 (or 1144897 counting only the distinct ones).

The product of its (nonzero) digits is 250, while the sum is 18.

The square root of 51520005 is about 7177.7437262694. The cubic root of 51520005 is about 372.0991107754.

The spelling of 51520005 in words is "fifty-one million, five hundred twenty thousand, five".