25964509 has 2 divisors, whose sum is σ = 25964510. Its totient is φ = 25964508.

The previous prime is 25964501. The next prime is 25964531. The reversal of 25964509 is 90546952.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22297284 + 3667225 = 4722^2 + 1915^2 .

It is a cyclic number.

It is not a de Polignac number, because 25964509 - 2³ = 25964501 is a prime.

It is a super-2 number, since 2×25964509² = 1348311455222162, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25964501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12982254 + 12982255.

It is an arithmetic number, because the mean of its divisors is an integer number (12982255).

Almost surely, 2^25964509 is an apocalyptic number.

It is an amenable number.

25964509 is a deficient number, since it is larger than the sum of its proper divisors (1).

25964509 is an equidigital number, since it uses as much as digits as its factorization.

25964509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 97200, while the sum is 40.

The square root of 25964509 is about 5095.5381462609. The cubic root of 25964509 is about 296.1147480905.

The spelling of 25964509 in words is "twenty-five million, nine hundred sixty-four thousand, five hundred nine".