257490323 has 2 divisors, whose sum is σ = 257490324. Its totient is φ = 257490322.

The previous prime is 257490301. The next prime is 257490329. The reversal of 257490323 is 323094752.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 257490323 - 2²⁰ = 256441747 is a prime.

It is not a weakly prime, because it can be changed into another prime (257490329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128745161 + 128745162.

It is an arithmetic number, because the mean of its divisors is an integer number (128745162).

Almost surely, 2^257490323 is an apocalyptic number.

257490323 is a deficient number, since it is larger than the sum of its proper divisors (1).

257490323 is an equidigital number, since it uses as much as digits as its factorization.

257490323 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 45360, while the sum is 35.

The square root of 257490323 is about 16046.5050088797. The cubic root of 257490323 is about 636.1901938657.

The spelling of 257490323 in words is "two hundred fifty-seven million, four hundred ninety thousand, three hundred twenty-three".