257211673 has 2 divisors, whose sum is σ = 257211674. Its totient is φ = 257211672.

The previous prime is 257211641. The next prime is 257211677. The reversal of 257211673 is 376112752.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 172055689 + 85155984 = 13117^2 + 9228^2 .

It is a cyclic number.

It is not a de Polignac number, because 257211673 - 2⁵ = 257211641 is a prime.

It is not a weakly prime, because it can be changed into another prime (257211677) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128605836 + 128605837.

It is an arithmetic number, because the mean of its divisors is an integer number (128605837).

Almost surely, 2^257211673 is an apocalyptic number.

It is an amenable number.

257211673 is a deficient number, since it is larger than the sum of its proper divisors (1).

257211673 is an equidigital number, since it uses as much as digits as its factorization.

257211673 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17640, while the sum is 34.

The square root of 257211673 is about 16037.8200825424. The cubic root of 257211673 is about 635.9606209879.

The spelling of 257211673 in words is "two hundred fifty-seven million, two hundred eleven thousand, six hundred seventy-three".