55307813 has 16 divisors (see below), whose sum is σ = 62633472. Its totient is φ = 48384000.

The previous prime is 55307809. The next prime is 55307831. The reversal of 55307813 is 31870355.

It is a cyclic number.

It is not a de Polignac number, because 55307813 - 2² = 55307809 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 55307813.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55307873) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 81845 + ... + 82517.

It is an arithmetic number, because the mean of its divisors is an integer number (3914592).

Almost surely, 2^55307813 is an apocalyptic number.

It is an amenable number.

55307813 is a deficient number, since it is larger than the sum of its proper divisors (7325659).

55307813 is a wasteful number, since it uses less digits than its factorization.

55307813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 956.

The product of its (nonzero) digits is 12600, while the sum is 32.

The square root of 55307813 is about 7436.9222800833. The cubic root of 55307813 is about 381.0033801249.

The spelling of 55307813 in words is "fifty-five million, three hundred seven thousand, eight hundred thirteen".