257653469 has 2 divisors, whose sum is σ = 257653470. Its totient is φ = 257653468.

The previous prime is 257653457. The next prime is 257653477. The reversal of 257653469 is 964356752.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 245298244 + 12355225 = 15662^2 + 3515^2 .

It is a cyclic number.

It is not a de Polignac number, because 257653469 - 2⁸ = 257653213 is a prime.

It is a super-2 number, since 2×257653469² = 132770620175467922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (257653439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128826734 + 128826735.

It is an arithmetic number, because the mean of its divisors is an integer number (128826735).

Almost surely, 2^257653469 is an apocalyptic number.

It is an amenable number.

257653469 is a deficient number, since it is larger than the sum of its proper divisors (1).

257653469 is an equidigital number, since it uses as much as digits as its factorization.

257653469 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1360800, while the sum is 47.

The square root of 257653469 is about 16051.5877407813. The cubic root of 257653469 is about 636.3245289752.

The spelling of 257653469 in words is "two hundred fifty-seven million, six hundred fifty-three thousand, four hundred sixty-nine".