55401257 has 2 divisors, whose sum is σ = 55401258. Its totient is φ = 55401256.

The previous prime is 55401253. The next prime is 55401263. The reversal of 55401257 is 75210455.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 50069776 + 5331481 = 7076^2 + 2309^2 .

It is a cyclic number.

It is not a de Polignac number, because 55401257 - 2² = 55401253 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (55401251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27700628 + 27700629.

It is an arithmetic number, because the mean of its divisors is an integer number (27700629).

Almost surely, 2^55401257 is an apocalyptic number.

It is an amenable number.

55401257 is a deficient number, since it is larger than the sum of its proper divisors (1).

55401257 is an equidigital number, since it uses as much as digits as its factorization.

55401257 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 55401257 is about 7443.2020663153. The cubic root of 55401257 is about 381.2178311297.

The spelling of 55401257 in words is "fifty-five million, four hundred one thousand, two hundred fifty-seven".