257790691 has 2 divisors, whose sum is σ = 257790692. Its totient is φ = 257790690.

The previous prime is 257790671. The next prime is 257790721. The reversal of 257790691 is 196097752.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 257790691 - 2⁹ = 257790179 is a prime.

It is not a weakly prime, because it can be changed into another prime (257790671) 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, 128895345 + 128895346.

It is an arithmetic number, because the mean of its divisors is an integer number (128895346).

Almost surely, 2^257790691 is an apocalyptic number.

257790691 is a deficient number, since it is larger than the sum of its proper divisors (1).

257790691 is an equidigital number, since it uses as much as digits as its factorization.

257790691 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 238140, while the sum is 46.

The square root of 257790691 is about 16055.8615776295. The cubic root of 257790691 is about 636.4374742528.

The spelling of 257790691 in words is "two hundred fifty-seven million, seven hundred ninety thousand, six hundred ninety-one".