55556251 has 2 divisors, whose sum is σ = 55556252. Its totient is φ = 55556250.

The previous prime is 55556231. The next prime is 55556273. The reversal of 55556251 is 15265555.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55556251 is a prime.

It is not a weakly prime, because it can be changed into another prime (55556231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27778125 + 27778126.

It is an arithmetic number, because the mean of its divisors is an integer number (27778126).

Almost surely, 2^55556251 is an apocalyptic number.

55556251 is a deficient number, since it is larger than the sum of its proper divisors (1).

55556251 is an equidigital number, since it uses as much as digits as its factorization.

55556251 is an evil number, because the sum of its binary digits is even.

The product of its digits is 37500, while the sum is 34.

The square root of 55556251 is about 7453.6065766849. The cubic root of 55556251 is about 381.5730063481.

The spelling of 55556251 in words is "fifty-five million, five hundred fifty-six thousand, two hundred fifty-one".