55915591 has 8 divisors (see below), whose sum is σ = 57105504. Its totient is φ = 54737280.

The previous prime is 55915579. The next prime is 55915619. The reversal of 55915591 is 19551955.

55915591 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 55915591 - 2⁷ = 55915463 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55915501) 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 7 ways as a sum of consecutive naturals, for example, 7206 + ... + 12796.

It is an arithmetic number, because the mean of its divisors is an integer number (7138188).

Almost surely, 2^55915591 is an apocalyptic number.

55915591 is a deficient number, since it is larger than the sum of its proper divisors (1189913).

55915591 is a wasteful number, since it uses less digits than its factorization.

55915591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5801.

The product of its digits is 50625, while the sum is 40.

The square root of 55915591 is about 7477.6728331748. The cubic root of 55915591 is about 382.3939153597.

The spelling of 55915591 in words is "fifty-five million, nine hundred fifteen thousand, five hundred ninety-one".