55111251 has 32 divisors (see below), whose sum is σ = 82494720. Its totient is φ = 32505984.

The previous prime is 55111247. The next prime is 55111261. The reversal of 55111251 is 15211155.

It is not a de Polignac number, because 55111251 - 2² = 55111247 is a prime.

It is not an unprimeable number, because it can be changed into a prime (55111201) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 98665 + ... + 99221.

It is an arithmetic number, because the mean of its divisors is an integer number (2577960).

Almost surely, 2^55111251 is an apocalyptic number.

55111251 is a deficient number, since it is larger than the sum of its proper divisors (27383469).

55111251 is a wasteful number, since it uses less digits than its factorization.

55111251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 675.

The product of its digits is 250, while the sum is 21.

The square root of 55111251 is about 7423.6952388955. The cubic root of 55111251 is about 380.5514868772.

The spelling of 55111251 in words is "fifty-five million, one hundred eleven thousand, two hundred fifty-one".