426391732909 has 2 divisors, whose sum is σ = 426391732910. Its totient is φ = 426391732908.

The previous prime is 426391732889. The next prime is 426391733029. The reversal of 426391732909 is 909237193624.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 331484608009 + 94907124900 = 575747^2 + 308070^2 .

It is a cyclic number.

It is not a de Polignac number, because 426391732909 - 2⁹ = 426391732397 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 426391732909.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (426391732409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 213195866454 + 213195866455.

It is an arithmetic number, because the mean of its divisors is an integer number (213195866455).

Almost surely, 2^426391732909 is an apocalyptic number.

It is an amenable number.

426391732909 is a deficient number, since it is larger than the sum of its proper divisors (1).

426391732909 is an equidigital number, since it uses as much as digits as its factorization.

426391732909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4408992, while the sum is 55.

The spelling of 426391732909 in words is "four hundred twenty-six billion, three hundred ninety-one million, seven hundred thirty-two thousand, nine hundred nine".