51436521 has 6 divisors (see below), whose sum is σ = 74297210. Its totient is φ = 34291008.

The previous prime is 51436519. The next prime is 51436523. The reversal of 51436521 is 12563415.

51436521 is a `hidden beast` number, since 5 + 1 + 4 + 3 + 652 + 1 = 666.

It is an interprime number because it is at equal distance from previous prime (51436519) and next prime (51436523).

It can be written as a sum of positive squares in only one way, i.e., 44355600 + 7080921 = 6660^2 + 2661^2 .

It is not a de Polignac number, because 51436521 - 2¹ = 51436519 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51436523) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2857576 + ... + 2857593.

Almost surely, 2^51436521 is an apocalyptic number.

It is an amenable number.

51436521 is a deficient number, since it is larger than the sum of its proper divisors (22860689).

51436521 is a wasteful number, since it uses less digits than its factorization.

51436521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5715175 (or 5715172 counting only the distinct ones).

The product of its digits is 3600, while the sum is 27.

The square root of 51436521 is about 7171.9258919763. The cubic root of 51436521 is about 371.8980166156.

Adding to 51436521 its reverse (12563415), we get a palindrome (63999936).

It can be divided in two parts, 5143 and 6521, that added together give a square (11664 = 108²).

The spelling of 51436521 in words is "fifty-one million, four hundred thirty-six thousand, five hundred twenty-one".