257421163 has 2 divisors, whose sum is σ = 257421164. Its totient is φ = 257421162.

The previous prime is 257421133. The next prime is 257421167. The reversal of 257421163 is 361124752.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 257421163 - 2²¹ = 255324011 is a prime.

It is not a weakly prime, because it can be changed into another prime (257421167) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128710581 + 128710582.

It is an arithmetic number, because the mean of its divisors is an integer number (128710582).

Almost surely, 2^257421163 is an apocalyptic number.

257421163 is a deficient number, since it is larger than the sum of its proper divisors (1).

257421163 is an equidigital number, since it uses as much as digits as its factorization.

257421163 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10080, while the sum is 31.

The square root of 257421163 is about 16044.3498777607. The cubic root of 257421163 is about 636.1332301021.

The spelling of 257421163 in words is "two hundred fifty-seven million, four hundred twenty-one thousand, one hundred sixty-three".