256212897 has 4 divisors (see below), whose sum is σ = 341617200. Its totient is φ = 170808596.

The previous prime is 256212889. The next prime is 256212907. The reversal of 256212897 is 798212652.

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 not a de Polignac number, because 256212897 - 2³ = 256212889 is a prime.

It is not an unprimeable number, because it can be changed into a prime (256212997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42702147 + ... + 42702152.

It is an arithmetic number, because the mean of its divisors is an integer number (85404300).

Almost surely, 2^256212897 is an apocalyptic number.

It is an amenable number.

256212897 is a deficient number, since it is larger than the sum of its proper divisors (85404303).

256212897 is an equidigital number, since it uses as much as digits as its factorization.

256212897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85404302.

The product of its digits is 120960, while the sum is 42.

The square root of 256212897 is about 16006.6516486116. The cubic root of 256212897 is about 635.1363891629.

The spelling of 256212897 in words is "two hundred fifty-six million, two hundred twelve thousand, eight hundred ninety-seven".