55686251 has 2 divisors, whose sum is σ = 55686252. Its totient is φ = 55686250.

The previous prime is 55686209. The next prime is 55686263. The reversal of 55686251 is 15268655.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55686251 is a prime.

It is not a weakly prime, because it can be changed into another prime (55686551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27843125 + 27843126.

It is an arithmetic number, because the mean of its divisors is an integer number (27843126).

Almost surely, 2^55686251 is an apocalyptic number.

55686251 is a deficient number, since it is larger than the sum of its proper divisors (1).

55686251 is an equidigital number, since it uses as much as digits as its factorization.

55686251 is an evil number, because the sum of its binary digits is even.

The product of its digits is 72000, while the sum is 38.

The square root of 55686251 is about 7462.3220916817. The cubic root of 55686251 is about 381.8703977255.

The spelling of 55686251 in words is "fifty-five million, six hundred eighty-six thousand, two hundred fifty-one".