256541403 has 4 divisors (see below), whose sum is σ = 342055208. Its totient is φ = 171027600.

The previous prime is 256541393. The next prime is 256541413. The reversal of 256541403 is 304145652.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (256541393) and next prime (256541413).

It is not a de Polignac number, because 256541403 - 2¹⁶ = 256475867 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256541413) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42756898 + ... + 42756903.

It is an arithmetic number, because the mean of its divisors is an integer number (85513802).

Almost surely, 2^256541403 is an apocalyptic number.

256541403 is a deficient number, since it is larger than the sum of its proper divisors (85513805).

256541403 is an equidigital number, since it uses as much as digits as its factorization.

256541403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85513804.

The product of its (nonzero) digits is 14400, while the sum is 30.

The square root of 256541403 is about 16016.9099079691. The cubic root of 256541403 is about 635.4077221155.

The spelling of 256541403 in words is "two hundred fifty-six million, five hundred forty-one thousand, four hundred three".