257883869 has 2 divisors, whose sum is σ = 257883870. Its totient is φ = 257883868.

The previous prime is 257883817. The next prime is 257883883. The reversal of 257883869 is 968388752.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 196840900 + 61042969 = 14030^2 + 7813^2 .

It is a cyclic number.

It is not a de Polignac number, because 257883869 - 2¹² = 257879773 is a prime.

It is a super-2 number, since 2×257883869² = 133008179780818322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (257883569) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128941934 + 128941935.

It is an arithmetic number, because the mean of its divisors is an integer number (128941935).

Almost surely, 2^257883869 is an apocalyptic number.

It is an amenable number.

257883869 is a deficient number, since it is larger than the sum of its proper divisors (1).

257883869 is an equidigital number, since it uses as much as digits as its factorization.

257883869 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5806080, while the sum is 56.

The square root of 257883869 is about 16058.7629971925. The cubic root of 257883869 is about 636.5141447580.

The spelling of 257883869 in words is "two hundred fifty-seven million, eight hundred eighty-three thousand, eight hundred sixty-nine".