426105991 has 2 divisors, whose sum is σ = 426105992. Its totient is φ = 426105990.

The previous prime is 426105983. The next prime is 426106001. The reversal of 426105991 is 199501624.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 426105991 - 2³ = 426105983 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 426105991.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (426105931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 213052995 + 213052996.

It is an arithmetic number, because the mean of its divisors is an integer number (213052996).

Almost surely, 2^426105991 is an apocalyptic number.

426105991 is a deficient number, since it is larger than the sum of its proper divisors (1).

426105991 is an equidigital number, since it uses as much as digits as its factorization.

426105991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 19440, while the sum is 37.

The square root of 426105991 is about 20642.3349212244. The cubic root of 426105991 is about 752.4989185534.

The spelling of 426105991 in words is "four hundred twenty-six million, one hundred five thousand, nine hundred ninety-one".