25683509 has 2 divisors, whose sum is σ = 25683510. Its totient is φ = 25683508.

The previous prime is 25683503. The next prime is 25683521. The reversal of 25683509 is 90538652.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14938225 + 10745284 = 3865^2 + 3278^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25683509 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25683503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12841754 + 12841755.

It is an arithmetic number, because the mean of its divisors is an integer number (12841755).

Almost surely, 2^25683509 is an apocalyptic number.

It is an amenable number.

25683509 is a deficient number, since it is larger than the sum of its proper divisors (1).

25683509 is an equidigital number, since it uses as much as digits as its factorization.

25683509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64800, while the sum is 38.

The square root of 25683509 is about 5067.8899948598. The cubic root of 25683509 is about 295.0426405853.

The spelling of 25683509 in words is "twenty-five million, six hundred eighty-three thousand, five hundred nine".