257434223 has 2 divisors, whose sum is σ = 257434224. Its totient is φ = 257434222.

The previous prime is 257434159. The next prime is 257434231. The reversal of 257434223 is 322434752.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 257434223 - 2⁶ = 257434159 is a prime.

It is a super-2 number, since 2×257434223² = 132544758343227458, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 257434223.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (257434273) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128717111 + 128717112.

It is an arithmetic number, because the mean of its divisors is an integer number (128717112).

Almost surely, 2^257434223 is an apocalyptic number.

257434223 is a deficient number, since it is larger than the sum of its proper divisors (1).

257434223 is an equidigital number, since it uses as much as digits as its factorization.

257434223 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 40320, while the sum is 32.

The square root of 257434223 is about 16044.7568694574. The cubic root of 257434223 is about 636.1439877769.

Adding to 257434223 its reverse (322434752), we get a palindrome (579868975).

The spelling of 257434223 in words is "two hundred fifty-seven million, four hundred thirty-four thousand, two hundred twenty-three".