25391249 has 8 divisors (see below), whose sum is σ = 27385512. Its totient is φ = 23402880.

The previous prime is 25391243. The next prime is 25391297. The reversal of 25391249 is 94219352.

It can be written as a sum of positive squares in 4 ways, for example, as 4752400 + 20638849 = 2180^2 + 4543^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25391249 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 (25391243) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12317 + ... + 14229.

It is an arithmetic number, because the mean of its divisors is an integer number (3423189).

Almost surely, 2^25391249 is an apocalyptic number.

It is an amenable number.

25391249 is a deficient number, since it is larger than the sum of its proper divisors (1994263).

25391249 is a wasteful number, since it uses less digits than its factorization.

25391249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2947.

The product of its digits is 19440, while the sum is 35.

The square root of 25391249 is about 5038.9730104457. The cubic root of 25391249 is about 293.9192437121.

The spelling of 25391249 in words is "twenty-five million, three hundred ninety-one thousand, two hundred forty-nine".