425993809 has 2 divisors, whose sum is σ = 425993810. Its totient is φ = 425993808.

The previous prime is 425993797. The next prime is 425993873. The reversal of 425993809 is 908399524.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 288048784 + 137945025 = 16972^2 + 11745^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-425993809 is a prime.

It is not a weakly prime, because it can be changed into another prime (425993609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 212996904 + 212996905.

It is an arithmetic number, because the mean of its divisors is an integer number (212996905).

Almost surely, 2^425993809 is an apocalyptic number.

It is an amenable number.

425993809 is a deficient number, since it is larger than the sum of its proper divisors (1).

425993809 is an equidigital number, since it uses as much as digits as its factorization.

425993809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 699840, while the sum is 49.

The square root of 425993809 is about 20639.6174625403. The cubic root of 425993809 is about 752.4328753273.

The spelling of 425993809 in words is "four hundred twenty-five million, nine hundred ninety-three thousand, eight hundred nine".