25613309 has 2 divisors, whose sum is σ = 25613310. Its totient is φ = 25613308.

The previous prime is 25613303. The next prime is 25613323. The reversal of 25613309 is 90331652.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13032100 + 12581209 = 3610^2 + 3547^2 .

It is a cyclic number.

It is not a de Polignac number, because 25613309 - 2¹⁶ = 25547773 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25613303) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12806654 + 12806655.

It is an arithmetic number, because the mean of its divisors is an integer number (12806655).

Almost surely, 2^25613309 is an apocalyptic number.

It is an amenable number.

25613309 is a deficient number, since it is larger than the sum of its proper divisors (1).

25613309 is an equidigital number, since it uses as much as digits as its factorization.

25613309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4860, while the sum is 29.

The square root of 25613309 is about 5060.9592964180. The cubic root of 25613309 is about 294.7735847672.

The spelling of 25613309 in words is "twenty-five million, six hundred thirteen thousand, three hundred nine".