256901995 has 32 divisors (see below), whose sum is σ = 362672640. Its totient is φ = 171037440.

The previous prime is 256901993. The next prime is 256902001. The reversal of 256901995 is 599109652.

It is not a de Polignac number, because 256901995 - 2¹ = 256901993 is a prime.

It is not an unprimeable number, because it can be changed into a prime (256901993) 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 31 ways as a sum of consecutive naturals, for example, 317151 + ... + 317959.

It is an arithmetic number, because the mean of its divisors is an integer number (11333520).

Almost surely, 2^256901995 is an apocalyptic number.

256901995 is a deficient number, since it is larger than the sum of its proper divisors (105770645).

256901995 is a wasteful number, since it uses less digits than its factorization.

256901995 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1075.

The product of its (nonzero) digits is 218700, while the sum is 46.

The square root of 256901995 is about 16028.1625584469. The cubic root of 256901995 is about 635.7052902942.

The spelling of 256901995 in words is "two hundred fifty-six million, nine hundred one thousand, nine hundred ninety-five".