431891 has 2 divisors, whose sum is σ = 431892. Its totient is φ = 431890.

The previous prime is 431887. The next prime is 431903. The reversal of 431891 is 198134.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 431891 - 2² = 431887 is a prime.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 431891.

It is not a weakly prime, because it can be changed into another prime (431801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 215945 + 215946.

It is an arithmetic number, because the mean of its divisors is an integer number (215946).

2⁴³¹⁸⁹¹ is an apocalyptic number.

431891 is a deficient number, since it is larger than the sum of its proper divisors (1).

431891 is an equidigital number, since it uses as much as digits as its factorization.

431891 is an evil number, because the sum of its binary digits is even.

The product of its digits is 864, while the sum is 26.

The square root of 431891 is about 657.1841446657. The cubic root of 431891 is about 75.5889045240.

The spelling of 431891 in words is "four hundred thirty-one thousand, eight hundred ninety-one".