25509149 has 2 divisors, whose sum is σ = 25509150. Its totient is φ = 25509148.

The previous prime is 25509119. The next prime is 25509151. The reversal of 25509149 is 94190552.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20748025 + 4761124 = 4555^2 + 2182^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25509149 is a prime.

It is a Sophie Germain prime.

Together with 25509151, it forms a pair of twin primes.

It is a Chen 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 (25509119) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12754574 + 12754575.

It is an arithmetic number, because the mean of its divisors is an integer number (12754575).

Almost surely, 2^25509149 is an apocalyptic number.

It is an amenable number.

25509149 is a deficient number, since it is larger than the sum of its proper divisors (1).

25509149 is an equidigital number, since it uses as much as digits as its factorization.

25509149 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16200, while the sum is 35.

The square root of 25509149 is about 5050.6582739283. The cubic root of 25509149 is about 294.3734629527.

The spelling of 25509149 in words is "twenty-five million, five hundred nine thousand, one hundred forty-nine".