256682121 has 4 divisors (see below), whose sum is σ = 342242832. Its totient is φ = 171121412.

The previous prime is 256682117. The next prime is 256682123. The reversal of 256682121 is 121286652.

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 256682121 - 2² = 256682117 is a prime.

It is a super-2 number, since 2×256682121² = 131771422482117282, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (256682123) 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 3 ways as a sum of consecutive naturals, for example, 42780351 + ... + 42780356.

It is an arithmetic number, because the mean of its divisors is an integer number (85560708).

Almost surely, 2^256682121 is an apocalyptic number.

It is an amenable number.

256682121 is a deficient number, since it is larger than the sum of its proper divisors (85560711).

256682121 is an equidigital number, since it uses as much as digits as its factorization.

256682121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85560710.

The product of its digits is 11520, while the sum is 33.

The square root of 256682121 is about 16021.3021006409. The cubic root of 256682121 is about 635.5238787534.

The spelling of 256682121 in words is "two hundred fifty-six million, six hundred eighty-two thousand, one hundred twenty-one".