51552621 has 12 divisors (see below), whose sum is σ = 76281660. Its totient is φ = 33529920.

The previous prime is 51552593. The next prime is 51552629. The reversal of 51552621 is 12625515.

51552621 is a `hidden beast` number, since 51 + 552 + 62 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 24147396 + 27405225 = 4914^2 + 5235^2 .

It is not a de Polignac number, because 51552621 - 2¹⁴ = 51536237 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51552629) 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, 69486 + ... + 70223.

It is an arithmetic number, because the mean of its divisors is an integer number (6356805).

Almost surely, 2^51552621 is an apocalyptic number.

It is an amenable number.

51552621 is a deficient number, since it is larger than the sum of its proper divisors (24729039).

51552621 is a wasteful number, since it uses less digits than its factorization.

51552621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139756 (or 139753 counting only the distinct ones).

The product of its digits is 3000, while the sum is 27.

The square root of 51552621 is about 7180.0153899557. The cubic root of 51552621 is about 372.1776163605.

It can be divided in two parts, 5155 and 2621, that added together give a 5-th power (7776 = 6⁵).

The spelling of 51552621 in words is "fifty-one million, five hundred fifty-two thousand, six hundred twenty-one".