331243427 has 2 divisors, whose sum is σ = 331243428. Its totient is φ = 331243426.

The previous prime is 331243421. The next prime is 331243439. The reversal of 331243427 is 724342133.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 331243427 - 2²² = 327049123 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 331243427.

It is not a weakly prime, because it can be changed into another prime (331243421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 165621713 + 165621714.

It is an arithmetic number, because the mean of its divisors is an integer number (165621714).

Almost surely, 2^331243427 is an apocalyptic number.

331243427 is a deficient number, since it is larger than the sum of its proper divisors (1).

331243427 is an equidigital number, since it uses as much as digits as its factorization.

331243427 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12096, while the sum is 29.

The square root of 331243427 is about 18200.0941481081. The cubic root of 331243427 is about 691.9091752394.

The spelling of 331243427 in words is "three hundred thirty-one million, two hundred forty-three thousand, four hundred twenty-seven".