431256643 has 4 divisors (see below), whose sum is σ = 433156680. Its totient is φ = 429356608.

The previous prime is 431256613. The next prime is 431256667. The reversal of 431256643 is 346652134.

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 431256643 - 2⁵ = 431256611 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 431256599 and 431256608.

It is not an unprimeable number, because it can be changed into a prime (431256613) 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, 949678 + ... + 950131.

It is an arithmetic number, because the mean of its divisors is an integer number (108289170).

Almost surely, 2^431256643 is an apocalyptic number.

431256643 is a deficient number, since it is larger than the sum of its proper divisors (1900037).

431256643 is a wasteful number, since it uses less digits than its factorization.

431256643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1900036.

The product of its digits is 51840, while the sum is 34.

The square root of 431256643 is about 20766.7196013237. The cubic root of 431256643 is about 755.5187832506.

The spelling of 431256643 in words is "four hundred thirty-one million, two hundred fifty-six thousand, six hundred forty-three".