25135609 has 2 divisors, whose sum is σ = 25135610. Its totient is φ = 25135608.

The previous prime is 25135603. The next prime is 25135631. The reversal of 25135609 is 90653152.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 23863225 + 1272384 = 4885^2 + 1128^2 .

It is a cyclic number.

It is not a de Polignac number, because 25135609 - 2¹⁷ = 25004537 is a prime.

It is not a weakly prime, because it can be changed into another prime (25135603) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12567804 + 12567805.

It is an arithmetic number, because the mean of its divisors is an integer number (12567805).

Almost surely, 2^25135609 is an apocalyptic number.

It is an amenable number.

25135609 is a deficient number, since it is larger than the sum of its proper divisors (1).

25135609 is an equidigital number, since it uses as much as digits as its factorization.

25135609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8100, while the sum is 31.

The square root of 25135609 is about 5013.5425599071. The cubic root of 25135609 is about 292.9295182385.

The spelling of 25135609 in words is "twenty-five million, one hundred thirty-five thousand, six hundred nine".