25136509 has 2 divisors, whose sum is σ = 25136510. Its totient is φ = 25136508.

The previous prime is 25136497. The next prime is 25136519. The reversal of 25136509 is 90563152.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22297284 + 2839225 = 4722^2 + 1685^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25136509 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25136519) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12568254 + 12568255.

It is an arithmetic number, because the mean of its divisors is an integer number (12568255).

Almost surely, 2^25136509 is an apocalyptic number.

It is an amenable number.

25136509 is a deficient number, since it is larger than the sum of its proper divisors (1).

25136509 is an equidigital number, since it uses as much as digits as its factorization.

25136509 is an evil number, because the sum of its binary digits is even.

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

The square root of 25136509 is about 5013.6323159961. The cubic root of 25136509 is about 292.9330143864.

The spelling of 25136509 in words is "twenty-five million, one hundred thirty-six thousand, five hundred nine".