426198391 has 2 divisors, whose sum is σ = 426198392. Its totient is φ = 426198390.

The previous prime is 426198389. The next prime is 426198401. The reversal of 426198391 is 193891624.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 426198391 - 2¹ = 426198389 is a prime.

Together with 426198389, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (426198361) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 213099195 + 213099196.

It is an arithmetic number, because the mean of its divisors is an integer number (213099196).

Almost surely, 2^426198391 is an apocalyptic number.

426198391 is a deficient number, since it is larger than the sum of its proper divisors (1).

426198391 is an equidigital number, since it uses as much as digits as its factorization.

426198391 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 93312, while the sum is 43.

The square root of 426198391 is about 20644.5729188085. The cubic root of 426198391 is about 752.5533071142.

The spelling of 426198391 in words is "four hundred twenty-six million, one hundred ninety-eight thousand, three hundred ninety-one".