55847257 has 2 divisors, whose sum is σ = 55847258. Its totient is φ = 55847256.

The previous prime is 55847219. The next prime is 55847273. The reversal of 55847257 is 75274855.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 52693081 + 3154176 = 7259^2 + 1776^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55847257 is a prime.

It is a super-2 number, since 2×55847257² = 6237832228848098, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (55847557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27923628 + 27923629.

It is an arithmetic number, because the mean of its divisors is an integer number (27923629).

Almost surely, 2^55847257 is an apocalyptic number.

It is an amenable number.

55847257 is a deficient number, since it is larger than the sum of its proper divisors (1).

55847257 is an equidigital number, since it uses as much as digits as its factorization.

55847257 is an evil number, because the sum of its binary digits is even.

The product of its digits is 392000, while the sum is 43.

The square root of 55847257 is about 7473.1022340123. The cubic root of 55847257 is about 382.2380783370.

The spelling of 55847257 in words is "fifty-five million, eight hundred forty-seven thousand, two hundred fifty-seven".