55407251 has 2 divisors, whose sum is σ = 55407252. Its totient is φ = 55407250.

The previous prime is 55407239. The next prime is 55407257. The reversal of 55407251 is 15270455.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 55407251 - 2¹⁰ = 55406227 is a prime.

It is not a weakly prime, because it can be changed into another prime (55407257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27703625 + 27703626.

It is an arithmetic number, because the mean of its divisors is an integer number (27703626).

Almost surely, 2^55407251 is an apocalyptic number.

55407251 is a deficient number, since it is larger than the sum of its proper divisors (1).

55407251 is an equidigital number, since it uses as much as digits as its factorization.

55407251 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7000, while the sum is 29.

The square root of 55407251 is about 7443.6047047113. The cubic root of 55407251 is about 381.2315789362.

The spelling of 55407251 in words is "fifty-five million, four hundred seven thousand, two hundred fifty-one".