257215193 has 2 divisors, whose sum is σ = 257215194. Its totient is φ = 257215192.

The previous prime is 257215177. The next prime is 257215213. The reversal of 257215193 is 391512752.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 256864729 + 350464 = 16027^2 + 592^2 .

It is a cyclic number.

It is not a de Polignac number, because 257215193 - 2⁴ = 257215177 is a prime.

It is not a weakly prime, because it can be changed into another prime (257215093) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128607596 + 128607597.

It is an arithmetic number, because the mean of its divisors is an integer number (128607597).

Almost surely, 2^257215193 is an apocalyptic number.

It is an amenable number.

257215193 is a deficient number, since it is larger than the sum of its proper divisors (1).

257215193 is an equidigital number, since it uses as much as digits as its factorization.

257215193 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18900, while the sum is 35.

The square root of 257215193 is about 16037.9298227670. The cubic root of 257215193 is about 635.9635220630.

The spelling of 257215193 in words is "two hundred fifty-seven million, two hundred fifteen thousand, one hundred ninety-three".