25990609 has 2 divisors, whose sum is σ = 25990610. Its totient is φ = 25990608.

The previous prime is 25990589. The next prime is 25990631. The reversal of 25990609 is 90609952.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25472209 + 518400 = 5047^2 + 720^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25990609 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (25990009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12995304 + 12995305.

It is an arithmetic number, because the mean of its divisors is an integer number (12995305).

Almost surely, 2^25990609 is an apocalyptic number.

It is an amenable number.

25990609 is a deficient number, since it is larger than the sum of its proper divisors (1).

25990609 is an equidigital number, since it uses as much as digits as its factorization.

25990609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 43740, while the sum is 40.

The square root of 25990609 is about 5098.0985671130. The cubic root of 25990609 is about 296.2139348525.

The spelling of 25990609 in words is "twenty-five million, nine hundred ninety thousand, six hundred nine".