257474117 has 2 divisors, whose sum is σ = 257474118. Its totient is φ = 257474116.

The previous prime is 257474071. The next prime is 257474123. The reversal of 257474117 is 711474752.

It is a Cunningham number, because it is equal to 16046²+1.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 257474116 + 1 = 16046^2 + 1^2 .

It is a cyclic number.

It is not a de Polignac number, because 257474117 - 2¹⁰ = 257473093 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (257474417) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128737058 + 128737059.

It is an arithmetic number, because the mean of its divisors is an integer number (128737059).

Almost surely, 2^257474117 is an apocalyptic number.

It is an amenable number.

257474117 is a deficient number, since it is larger than the sum of its proper divisors (1).

257474117 is an equidigital number, since it uses as much as digits as its factorization.

257474117 is an evil number, because the sum of its binary digits is even.

The product of its digits is 54880, while the sum is 38.

The square root of 257474117 is about 16046.0000311604. Note that the first 4 decimals coincide. The cubic root of 257474117 is about 636.1768466785.

The spelling of 257474117 in words is "two hundred fifty-seven million, four hundred seventy-four thousand, one hundred seventeen".