55536521 has 4 divisors (see below), whose sum is σ = 56828112. Its totient is φ = 54244932.

The previous prime is 55536499. The next prime is 55536541. The reversal of 55536521 is 12563555.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 55536521 - 2²² = 51342217 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (55536541) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 645731 + ... + 645816.

It is an arithmetic number, because the mean of its divisors is an integer number (14207028).

Almost surely, 2^55536521 is an apocalyptic number.

It is an amenable number.

55536521 is a deficient number, since it is larger than the sum of its proper divisors (1291591).

55536521 is a wasteful number, since it uses less digits than its factorization.

55536521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1291590.

The product of its digits is 22500, while the sum is 32.

The square root of 55536521 is about 7452.2829388047. The cubic root of 55536521 is about 381.5278309529.

The spelling of 55536521 in words is "fifty-five million, five hundred thirty-six thousand, five hundred twenty-one".