256899997 has 4 divisors (see below), whose sum is σ = 258319516. Its totient is φ = 255480480.

The previous prime is 256899977. The next prime is 256900001. The reversal of 256899997 is 799998652.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 13883076 + 243016921 = 3726^2 + 15589^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-256899997 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256899967) 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, 709488 + ... + 709849.

It is an arithmetic number, because the mean of its divisors is an integer number (64579879).

Almost surely, 2^256899997 is an apocalyptic number.

It is an amenable number.

256899997 is a deficient number, since it is larger than the sum of its proper divisors (1419519).

256899997 is a wasteful number, since it uses less digits than its factorization.

256899997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1419518.

The product of its digits is 22044960, while the sum is 64.

The square root of 256899997 is about 16028.1002305326. The cubic root of 256899997 is about 635.7036422695.

The spelling of 256899997 in words is "two hundred fifty-six million, eight hundred ninety-nine thousand, nine hundred ninety-seven".