55056813 has 32 divisors (see below), whose sum is σ = 90393600. Its totient is φ = 29102976.

The previous prime is 55056773. The next prime is 55056821. The reversal of 55056813 is 31865055.

It is not a de Polignac number, because 55056813 - 2⁹ = 55056301 is a prime.

It is a super-3 number, since 3×55056813³ (a number of 24 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55056823) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 15553 + ... + 18761.

It is an arithmetic number, because the mean of its divisors is an integer number (2824800).

Almost surely, 2^55056813 is an apocalyptic number.

It is an amenable number.

55056813 is a deficient number, since it is larger than the sum of its proper divisors (35336787).

55056813 is a wasteful number, since it uses less digits than its factorization.

55056813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3281.

The product of its (nonzero) digits is 18000, while the sum is 33.

The square root of 55056813 is about 7420.0278301365. The cubic root of 55056813 is about 380.4261447354.

The spelling of 55056813 in words is "fifty-five million, fifty-six thousand, eight hundred thirteen".