25395509 has 2 divisors, whose sum is σ = 25395510. Its totient is φ = 25395508.

The previous prime is 25395497. The next prime is 25395641. The reversal of 25395509 is 90559352.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14273284 + 11122225 = 3778^2 + 3335^2 .

It is a cyclic number.

It is not a de Polignac number, because 25395509 - 2¹² = 25391413 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 (25305509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12697754 + 12697755.

It is an arithmetic number, because the mean of its divisors is an integer number (12697755).

Almost surely, 2^25395509 is an apocalyptic number.

It is an amenable number.

25395509 is a deficient number, since it is larger than the sum of its proper divisors (1).

25395509 is an equidigital number, since it uses as much as digits as its factorization.

25395509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 60750, while the sum is 38.

The square root of 25395509 is about 5039.3956978987. The cubic root of 25395509 is about 293.9356801618.

The spelling of 25395509 in words is "twenty-five million, three hundred ninety-five thousand, five hundred nine".