55911213 has 6 divisors (see below), whose sum is σ = 80760654. Its totient is φ = 37274136.

The previous prime is 55911209. The next prime is 55911227. The reversal of 55911213 is 31211955.

55911213 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 53846244 + 2064969 = 7338^2 + 1437^2 .

It is not a de Polignac number, because 55911213 - 2² = 55911209 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55911253) 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 5 ways as a sum of consecutive naturals, for example, 3106170 + ... + 3106187.

It is an arithmetic number, because the mean of its divisors is an integer number (13460109).

Almost surely, 2^55911213 is an apocalyptic number.

It is an amenable number.

55911213 is a deficient number, since it is larger than the sum of its proper divisors (24849441).

55911213 is a wasteful number, since it uses less digits than its factorization.

55911213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6212363 (or 6212360 counting only the distinct ones).

The product of its digits is 1350, while the sum is 27.

The square root of 55911213 is about 7477.3800893094. The cubic root of 55911213 is about 382.3839350529.

The spelling of 55911213 in words is "fifty-five million, nine hundred eleven thousand, two hundred thirteen".