431491811 has 2 divisors, whose sum is σ = 431491812. Its totient is φ = 431491810.

The previous prime is 431491769. The next prime is 431491867. The reversal of 431491811 is 118194134.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-431491811 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (431496811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 215745905 + 215745906.

It is an arithmetic number, because the mean of its divisors is an integer number (215745906).

Almost surely, 2^431491811 is an apocalyptic number.

431491811 is a deficient number, since it is larger than the sum of its proper divisors (1).

431491811 is an equidigital number, since it uses as much as digits as its factorization.

431491811 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3456, while the sum is 32.

The square root of 431491811 is about 20772.3809660809. The cubic root of 431491811 is about 755.6560886179.

The spelling of 431491811 in words is "four hundred thirty-one million, four hundred ninety-one thousand, eight hundred eleven".