426664391 has 2 divisors, whose sum is σ = 426664392. Its totient is φ = 426664390.

The previous prime is 426664367. The next prime is 426664417. The reversal of 426664391 is 193466624.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 426664391 - 2¹⁸ = 426402247 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (426624391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 213332195 + 213332196.

It is an arithmetic number, because the mean of its divisors is an integer number (213332196).

Almost surely, 2^426664391 is an apocalyptic number.

426664391 is a deficient number, since it is larger than the sum of its proper divisors (1).

426664391 is an equidigital number, since it uses as much as digits as its factorization.

426664391 is an evil number, because the sum of its binary digits is even.

The product of its digits is 186624, while the sum is 41.

The square root of 426664391 is about 20655.8560945801. The cubic root of 426664391 is about 752.8274846747.

The spelling of 426664391 in words is "four hundred twenty-six million, six hundred sixty-four thousand, three hundred ninety-one".