256919197 has 4 divisors (see below), whose sum is σ = 270441280. Its totient is φ = 243397116.

The previous prime is 256919153. The next prime is 256919203. The reversal of 256919197 is 791919652.

256919197 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-256919197 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 256919197.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256919107) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6761013 + ... + 6761050.

It is an arithmetic number, because the mean of its divisors is an integer number (67610320).

Almost surely, 2^256919197 is an apocalyptic number.

It is an amenable number.

256919197 is a deficient number, since it is larger than the sum of its proper divisors (13522083).

256919197 is a wasteful number, since it uses less digits than its factorization.

256919197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13522082.

The product of its digits is 306180, while the sum is 49.

The square root of 256919197 is about 16028.6991674309. The cubic root of 256919197 is about 635.7194787896.

The spelling of 256919197 in words is "two hundred fifty-six million, nine hundred nineteen thousand, one hundred ninety-seven".