257261423 has 2 divisors, whose sum is σ = 257261424. Its totient is φ = 257261422.

The previous prime is 257261399. The next prime is 257261449. The reversal of 257261423 is 324162752.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 257261423 - 2²² = 253067119 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 257261423.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (257261623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128630711 + 128630712.

It is an arithmetic number, because the mean of its divisors is an integer number (128630712).

Almost surely, 2^257261423 is an apocalyptic number.

257261423 is a deficient number, since it is larger than the sum of its proper divisors (1).

257261423 is an equidigital number, since it uses as much as digits as its factorization.

257261423 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20160, while the sum is 32.

The square root of 257261423 is about 16039.3710288153. The cubic root of 257261423 is about 636.0016209431.

The spelling of 257261423 in words is "two hundred fifty-seven million, two hundred sixty-one thousand, four hundred twenty-three".