25305249 has 4 divisors (see below), whose sum is σ = 33740336. Its totient is φ = 16870164.

The previous prime is 25305233. The next prime is 25305251. The reversal of 25305249 is 94250352.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 25305249 - 2⁴ = 25305233 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (25305149) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4217539 + ... + 4217544.

It is an arithmetic number, because the mean of its divisors is an integer number (8435084).

Almost surely, 2^25305249 is an apocalyptic number.

It is an amenable number.

25305249 is a deficient number, since it is larger than the sum of its proper divisors (8435087).

25305249 is an equidigital number, since it uses as much as digits as its factorization.

25305249 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8435086.

The product of its (nonzero) digits is 10800, while the sum is 30.

The square root of 25305249 is about 5030.4322875872. The cubic root of 25305249 is about 293.5870341580.

The spelling of 25305249 in words is "twenty-five million, three hundred five thousand, two hundred forty-nine".