431999999 has 2 divisors, whose sum is σ = 432000000. Its totient is φ = 431999998.

The previous prime is 431999989. The next prime is 432000001. The reversal of 431999999 is 999999134.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-431999999 is a prime.

It is a Sophie Germain prime.

Together with 432000001, it forms a pair of twin primes.

It is a Chen prime.

431999999 is a modest number, since divided by 99999 gives 4319 as remainder.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (431999929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 215999999 + 216000000.

It is an arithmetic number, because the mean of its divisors is an integer number (216000000).

Almost surely, 2^431999999 is an apocalyptic number.

431999999 is a deficient number, since it is larger than the sum of its proper divisors (1).

431999999 is an equidigital number, since it uses as much as digits as its factorization.

431999999 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6377292, while the sum is 62.

The square root of 431999999 is about 20784.6096667703. The cubic root of 431999999 is about 755.9526293536.

The spelling of 431999999 in words is "four hundred thirty-one million, nine hundred ninety-nine thousand, nine hundred ninety-nine".