256945143 has 64 divisors (see below), whose sum is σ = 441147392. Its totient is φ = 129392640.

The previous prime is 256945109. The next prime is 256945147. The reversal of 256945143 is 341549652.

It is not a de Polignac number, because 256945143 - 2⁹ = 256944631 is a prime.

It is a super-2 number, since 2×256945143² = 132041613022580898, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256945147) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 820755 + ... + 821067.

It is an arithmetic number, because the mean of its divisors is an integer number (6892928).

Almost surely, 2^256945143 is an apocalyptic number.

256945143 is a deficient number, since it is larger than the sum of its proper divisors (184202249).

256945143 is a wasteful number, since it uses less digits than its factorization.

256945143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 464.

The product of its digits is 129600, while the sum is 39.

The square root of 256945143 is about 16029.5085077491. The cubic root of 256945143 is about 635.7408782835.

The spelling of 256945143 in words is "two hundred fifty-six million, nine hundred forty-five thousand, one hundred forty-three".