25539149 has 2 divisors, whose sum is σ = 25539150. Its totient is φ = 25539148.

The previous prime is 25539113. The next prime is 25539167. The reversal of 25539149 is 94193552.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17598025 + 7941124 = 4195^2 + 2818^2 .

It is a cyclic number.

It is not a de Polignac number, because 25539149 - 2²⁰ = 24490573 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25539179) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12769574 + 12769575.

It is an arithmetic number, because the mean of its divisors is an integer number (12769575).

Almost surely, 2^25539149 is an apocalyptic number.

It is an amenable number.

25539149 is a deficient number, since it is larger than the sum of its proper divisors (1).

25539149 is an equidigital number, since it uses as much as digits as its factorization.

25539149 is an evil number, because the sum of its binary digits is even.

The product of its digits is 48600, while the sum is 38.

The square root of 25539149 is about 5053.6273111499. The cubic root of 25539149 is about 294.4888169142.

The spelling of 25539149 in words is "twenty-five million, five hundred thirty-nine thousand, one hundred forty-nine".