55561115 has 16 divisors (see below), whose sum is σ = 68043360. Its totient is φ = 43545600.

The previous prime is 55561043. The next prime is 55561139. The reversal of 55561115 is 51116555.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-55561115 is a prime.

It is a nialpdrome in base 14.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 52340 + ... + 53390.

It is an arithmetic number, because the mean of its divisors is an integer number (4252710).

Almost surely, 2^55561115 is an apocalyptic number.

55561115 is a deficient number, since it is larger than the sum of its proper divisors (12482245).

55561115 is a wasteful number, since it uses less digits than its factorization.

55561115 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1262.

The product of its digits is 3750, while the sum is 29.

The square root of 55561115 is about 7453.9328545406. The cubic root of 55561115 is about 381.5841417104.

The spelling of 55561115 in words is "fifty-five million, five hundred sixty-one thousand, one hundred fifteen".