256443131 has 8 divisors (see below), whose sum is σ = 294359520. Its totient is φ = 218847168.

The previous prime is 256443127. The next prime is 256443137. The reversal of 256443131 is 131344652.

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 256443131 - 2² = 256443127 is a prime.

It is a super-2 number, since 2×256443131² = 131526158874166322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 256443094 and 256443103.

It is not an unprimeable number, because it can be changed into a prime (256443137) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 78386 + ... + 81591.

It is an arithmetic number, because the mean of its divisors is an integer number (36794940).

Almost surely, 2^256443131 is an apocalyptic number.

256443131 is a deficient number, since it is larger than the sum of its proper divisors (37916389).

256443131 is a wasteful number, since it uses less digits than its factorization.

256443131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160213.

The product of its digits is 8640, while the sum is 29.

The square root of 256443131 is about 16013.8418563442. The cubic root of 256443131 is about 635.3265776273.

Adding to 256443131 its reverse (131344652), we get a palindrome (387787783).

The spelling of 256443131 in words is "two hundred fifty-six million, four hundred forty-three thousand, one hundred thirty-one".