256431897 has 12 divisors (see below), whose sum is σ = 370584240. Its totient is φ = 170870328.

The previous prime is 256431883. The next prime is 256431947. The reversal of 256431897 is 798134652.

256431897 is a `hidden beast` number, since 2 + 564 + 3 + 1 + 89 + 7 = 666.

It is not a de Polignac number, because 256431897 - 2¹⁶ = 256366361 is a prime.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (256431697) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 16338 + ... + 27924.

It is an arithmetic number, because the mean of its divisors is an integer number (30882020).

Almost surely, 2^256431897 is an apocalyptic number.

It is an amenable number.

256431897 is a deficient number, since it is larger than the sum of its proper divisors (114152343).

256431897 is a wasteful number, since it uses less digits than its factorization.

256431897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14052 (or 14049 counting only the distinct ones).

The product of its digits is 362880, while the sum is 45.

The square root of 256431897 is about 16013.4910934499. The cubic root of 256431897 is about 635.3173002449.

The spelling of 256431897 in words is "two hundred fifty-six million, four hundred thirty-one thousand, eight hundred ninety-seven".