257619161 has 2 divisors, whose sum is σ = 257619162. Its totient is φ = 257619160.

The previous prime is 257619107. The next prime is 257619163. The reversal of 257619161 is 161916752.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 257281600 + 337561 = 16040^2 + 581^2 .

It is a cyclic number.

It is not a de Polignac number, because 257619161 - 2²⁶ = 190510297 is a prime.

It is a super-2 number, since 2×257619161² = 132735264228687842, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 257619163, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (257619163) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128809580 + 128809581.

It is an arithmetic number, because the mean of its divisors is an integer number (128809581).

Almost surely, 2^257619161 is an apocalyptic number.

It is an amenable number.

257619161 is a deficient number, since it is larger than the sum of its proper divisors (1).

257619161 is an equidigital number, since it uses as much as digits as its factorization.

257619161 is an evil number, because the sum of its binary digits is even.

The product of its digits is 22680, while the sum is 38.

The square root of 257619161 is about 16050.5190258758. The cubic root of 257619161 is about 636.2962843319.

The spelling of 257619161 in words is "two hundred fifty-seven million, six hundred nineteen thousand, one hundred sixty-one".