256955081 has 2 divisors, whose sum is σ = 256955082. Its totient is φ = 256955080.

The previous prime is 256955053. The next prime is 256955113. The reversal of 256955081 is 180559652.

256955081 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 206899456 + 50055625 = 14384^2 + 7075^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-256955081 is a prime.

It is a super-2 number, since 2×256955081² = 132051827303433122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (256955381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128477540 + 128477541.

It is an arithmetic number, because the mean of its divisors is an integer number (128477541).

Almost surely, 2^256955081 is an apocalyptic number.

It is an amenable number.

256955081 is a deficient number, since it is larger than the sum of its proper divisors (1).

256955081 is an equidigital number, since it uses as much as digits as its factorization.

256955081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 108000, while the sum is 41.

The square root of 256955081 is about 16029.8184955414. The cubic root of 256955081 is about 635.7490744706.

The spelling of 256955081 in words is "two hundred fifty-six million, nine hundred fifty-five thousand, eighty-one".