257673499 has 2 divisors, whose sum is σ = 257673500. Its totient is φ = 257673498.

The previous prime is 257673487. The next prime is 257673503. The reversal of 257673499 is 994376752.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 257673499 - 2²³ = 249284891 is a prime.

It is not a weakly prime, because it can be changed into another prime (257673469) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128836749 + 128836750.

It is an arithmetic number, because the mean of its divisors is an integer number (128836750).

Almost surely, 2^257673499 is an apocalyptic number.

257673499 is a deficient number, since it is larger than the sum of its proper divisors (1).

257673499 is an equidigital number, since it uses as much as digits as its factorization.

257673499 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2857680, while the sum is 52.

The square root of 257673499 is about 16052.2116544730. The cubic root of 257673499 is about 636.3410178535.

The spelling of 257673499 in words is "two hundred fifty-seven million, six hundred seventy-three thousand, four hundred ninety-nine".