256961003 has 8 divisors (see below), whose sum is σ = 276863328. Its totient is φ = 237078144.

The previous prime is 256960993. The next prime is 256961027. The reversal of 256961003 is 300169652.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 256961003 - 2⁸ = 256960747 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256961053) 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 7 ways as a sum of consecutive naturals, for example, 34250 + ... + 41072.

It is an arithmetic number, because the mean of its divisors is an integer number (34607916).

Almost surely, 2^256961003 is an apocalyptic number.

256961003 is a deficient number, since it is larger than the sum of its proper divisors (19902325).

256961003 is a wasteful number, since it uses less digits than its factorization.

256961003 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9733.

The product of its (nonzero) digits is 9720, while the sum is 32.

The square root of 256961003 is about 16030.0032127258. The cubic root of 256961003 is about 635.7539584333.

The spelling of 256961003 in words is "two hundred fifty-six million, nine hundred sixty-one thousand, three".