431136643 has 12 divisors (see below), whose sum is σ = 531028872. Its totient is φ = 347807040.

The previous prime is 431136631. The next prime is 431136653. The reversal of 431136643 is 346631134.

It is a happy number.

It is not a de Polignac number, because 431136643 - 2²¹ = 429039491 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (431136653) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 257953 + ... + 259618.

It is an arithmetic number, because the mean of its divisors is an integer number (44252406).

Almost surely, 2^431136643 is an apocalyptic number.

431136643 is a deficient number, since it is larger than the sum of its proper divisors (99892229).

431136643 is a wasteful number, since it uses less digits than its factorization.

431136643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 517602 (or 517595 counting only the distinct ones).

The product of its digits is 15552, while the sum is 31.

The square root of 431136643 is about 20763.8301620871. The cubic root of 431136643 is about 755.4487007248.

Adding to 431136643 its reverse (346631134), we get a palindrome (777767777).

The spelling of 431136643 in words is "four hundred thirty-one million, one hundred thirty-six thousand, six hundred forty-three".