55613813 has 4 divisors (see below), whose sum is σ = 56556480. Its totient is φ = 54671148.

The previous prime is 55613797. The next prime is 55613821. The reversal of 55613813 is 31831655.

55613813 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 55613813 - 2⁴ = 55613797 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 55613813.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55613113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 471245 + ... + 471362.

It is an arithmetic number, because the mean of its divisors is an integer number (14139120).

Almost surely, 2^55613813 is an apocalyptic number.

It is an amenable number.

55613813 is a deficient number, since it is larger than the sum of its proper divisors (942667).

55613813 is an equidigital number, since it uses as much as digits as its factorization.

55613813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 942666.

The product of its digits is 10800, while the sum is 32.

The square root of 55613813 is about 7457.4669291925. The cubic root of 55613813 is about 381.7047438434.

The spelling of 55613813 in words is "fifty-five million, six hundred thirteen thousand, eight hundred thirteen".