256731443 has 4 divisors (see below), whose sum is σ = 256897680. Its totient is φ = 256565208.

The previous prime is 256731427. The next prime is 256731469. The reversal of 256731443 is 344137652.

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

It is a cyclic number.

It is not a de Polignac number, because 256731443 - 2⁴ = 256731427 is a prime.

It is a super-2 number, since 2×256731443² = 131822067649724498, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256731473) 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, 80780 + ... + 83897.

It is an arithmetic number, because the mean of its divisors is an integer number (64224420).

Almost surely, 2^256731443 is an apocalyptic number.

256731443 is a deficient number, since it is larger than the sum of its proper divisors (166237).

256731443 is a wasteful number, since it uses less digits than its factorization.

256731443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166236.

The product of its digits is 60480, while the sum is 35.

The square root of 256731443 is about 16022.8412898587. The cubic root of 256731443 is about 635.5645818886.

The spelling of 256731443 in words is "two hundred fifty-six million, seven hundred thirty-one thousand, four hundred forty-three".