256258193 has 2 divisors, whose sum is σ = 256258194. Its totient is φ = 256258192.

The previous prime is 256258169. The next prime is 256258207. The reversal of 256258193 is 391852652.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 251793424 + 4464769 = 15868^2 + 2113^2 .

It is a cyclic number.

It is not a de Polignac number, because 256258193 - 2²⁶ = 189149329 is a prime.

It is a super-2 number, since 2×256258193² = 131336522959250498, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 256258193.

It is not a weakly prime, because it can be changed into another prime (256252193) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128129096 + 128129097.

It is an arithmetic number, because the mean of its divisors is an integer number (128129097).

Almost surely, 2^256258193 is an apocalyptic number.

It is an amenable number.

256258193 is a deficient number, since it is larger than the sum of its proper divisors (1).

256258193 is an equidigital number, since it uses as much as digits as its factorization.

256258193 is an evil number, because the sum of its binary digits is even.

The product of its digits is 129600, while the sum is 41.

The square root of 256258193 is about 16008.0664978629. The cubic root of 256258193 is about 635.1738156456.

The spelling of 256258193 in words is "two hundred fifty-six million, two hundred fifty-eight thousand, one hundred ninety-three".