55636813 has 4 divisors (see below), whose sum is σ = 55762848. Its totient is φ = 55510780.

The previous prime is 55636811. The next prime is 55636829. The reversal of 55636813 is 31863655.

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 55636813 - 2¹ = 55636811 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55636811) 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, 62353 + ... + 63238.

It is an arithmetic number, because the mean of its divisors is an integer number (13940712).

Almost surely, 2^55636813 is an apocalyptic number.

It is an amenable number.

55636813 is a deficient number, since it is larger than the sum of its proper divisors (126035).

55636813 is a wasteful number, since it uses less digits than its factorization.

55636813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126034.

The product of its digits is 64800, while the sum is 37.

The square root of 55636813 is about 7459.0088483658. The cubic root of 55636813 is about 381.7573566666.

The spelling of 55636813 in words is "fifty-five million, six hundred thirty-six thousand, eight hundred thirteen".