55991895 has 16 divisors (see below), whose sum is σ = 92676960. Its totient is φ = 28832384.

The previous prime is 55991893. The next prime is 55991909. The reversal of 55991895 is 59819955.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 55991895 - 2¹ = 55991893 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55991893) 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, 63924 + ... + 64793.

It is an arithmetic number, because the mean of its divisors is an integer number (5792310).

Almost surely, 2^55991895 is an apocalyptic number.

55991895 is a deficient number, since it is larger than the sum of its proper divisors (36685065).

55991895 is a wasteful number, since it uses less digits than its factorization.

55991895 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128754.

The product of its digits is 729000, while the sum is 51.

The square root of 55991895 is about 7482.7732158605. The cubic root of 55991895 is about 382.5677781553.

The spelling of 55991895 in words is "fifty-five million, nine hundred ninety-one thousand, eight hundred ninety-five".