256955197 has 2 divisors, whose sum is σ = 256955198. Its totient is φ = 256955196.

The previous prime is 256955173. The next prime is 256955201. The reversal of 256955197 is 791559652.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 254913156 + 2042041 = 15966^2 + 1429^2 .

It is a cyclic number.

It is not a de Polignac number, because 256955197 - 2²⁷ = 122737469 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 256955197.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (256955137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128477598 + 128477599.

It is an arithmetic number, because the mean of its divisors is an integer number (128477599).

Almost surely, 2^256955197 is an apocalyptic number.

It is an amenable number.

256955197 is a deficient number, since it is larger than the sum of its proper divisors (1).

256955197 is an equidigital number, since it uses as much as digits as its factorization.

256955197 is an evil number, because the sum of its binary digits is even.

The product of its digits is 850500, while the sum is 49.

The square root of 256955197 is about 16029.8221137978. The cubic root of 256955197 is about 635.7491701383.

The spelling of 256955197 in words is "two hundred fifty-six million, nine hundred fifty-five thousand, one hundred ninety-seven".