431142991 has 2 divisors, whose sum is σ = 431142992. Its totient is φ = 431142990.

The previous prime is 431142949. The next prime is 431143007. The reversal of 431142991 is 199241134.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 431142991 - 2⁹ = 431142479 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (431142931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 215571495 + 215571496.

It is an arithmetic number, because the mean of its divisors is an integer number (215571496).

Almost surely, 2^431142991 is an apocalyptic number.

431142991 is a deficient number, since it is larger than the sum of its proper divisors (1).

431142991 is an equidigital number, since it uses as much as digits as its factorization.

431142991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7776, while the sum is 34.

The square root of 431142991 is about 20763.9830234953. The cubic root of 431142991 is about 755.4524084161.

The spelling of 431142991 in words is "four hundred thirty-one million, one hundred forty-two thousand, nine hundred ninety-one".