256512997 has 8 divisors (see below), whose sum is σ = 288255744. Its totient is φ = 226486128.

The previous prime is 256512973. The next prime is 256513001. The reversal of 256512997 is 799215652.

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 256512997 - 2¹¹ = 256510949 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 (256512947) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 428653 + ... + 429250.

It is an arithmetic number, because the mean of its divisors is an integer number (36031968).

Almost surely, 2^256512997 is an apocalyptic number.

It is an amenable number.

256512997 is a deficient number, since it is larger than the sum of its proper divisors (31742747).

256512997 is a wasteful number, since it uses less digits than its factorization.

256512997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 857939.

The product of its digits is 340200, while the sum is 46.

The square root of 256512997 is about 16016.0231331002. The cubic root of 256512997 is about 635.3842690358.

The spelling of 256512997 in words is "two hundred fifty-six million, five hundred twelve thousand, nine hundred ninety-seven".