257673197 has 2 divisors, whose sum is σ = 257673198. Its totient is φ = 257673196.

The previous prime is 257673179. The next prime is 257673253. The reversal of 257673197 is 791376752.

Together with previous prime (257673179) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 208196041 + 49477156 = 14429^2 + 7034^2 .

It is a cyclic number.

It is not a de Polignac number, because 257673197 - 2²² = 253478893 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (257673107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128836598 + 128836599.

It is an arithmetic number, because the mean of its divisors is an integer number (128836599).

Almost surely, 2^257673197 is an apocalyptic number.

It is an amenable number.

257673197 is a deficient number, since it is larger than the sum of its proper divisors (1).

257673197 is an equidigital number, since it uses as much as digits as its factorization.

257673197 is an evil number, because the sum of its binary digits is even.

The product of its digits is 555660, while the sum is 47.

The square root of 257673197 is about 16052.2022476668. The cubic root of 257673197 is about 636.3407692507.

The spelling of 257673197 in words is "two hundred fifty-seven million, six hundred seventy-three thousand, one hundred ninety-seven".