256197689 has 8 divisors (see below), whose sum is σ = 279622368. Its totient is φ = 232795360.

The previous prime is 256197679. The next prime is 256197727. The reversal of 256197689 is 986791652.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 256197689 - 2⁴ = 256197673 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 256197689.

It is not an unprimeable number, because it can be changed into a prime (256197649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26354 + ... + 34740.

It is an arithmetic number, because the mean of its divisors is an integer number (34952796).

Almost surely, 2^256197689 is an apocalyptic number.

It is an amenable number.

256197689 is a deficient number, since it is larger than the sum of its proper divisors (23424679).

256197689 is a wasteful number, since it uses less digits than its factorization.

256197689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11175.

The product of its digits is 1632960, while the sum is 53.

The square root of 256197689 is about 16006.1765890546. The cubic root of 256197689 is about 635.1238223413.

The spelling of 256197689 in words is "two hundred fifty-six million, one hundred ninety-seven thousand, six hundred eighty-nine".