257641859 has 2 divisors, whose sum is σ = 257641860. Its totient is φ = 257641858.

The previous prime is 257641823. The next prime is 257641873. The reversal of 257641859 is 958146752.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 257641859 - 2¹² = 257637763 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (257641459) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128820929 + 128820930.

It is an arithmetic number, because the mean of its divisors is an integer number (128820930).

Almost surely, 2^257641859 is an apocalyptic number.

257641859 is a deficient number, since it is larger than the sum of its proper divisors (1).

257641859 is an equidigital number, since it uses as much as digits as its factorization.

257641859 is an evil number, because the sum of its binary digits is even.

The product of its digits is 604800, while the sum is 47.

The square root of 257641859 is about 16051.2260902400. The cubic root of 257641859 is about 636.3149711263.

The spelling of 257641859 in words is "two hundred fifty-seven million, six hundred forty-one thousand, eight hundred fifty-nine".