25781249 has 8 divisors (see below), whose sum is σ = 27804672. Its totient is φ = 23763600.

The previous prime is 25781237. The next prime is 25781257. The reversal of 25781249 is 94218752.

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

It is a cyclic number.

It is a trimorphic number since its cube, 17136094960327225781249, ends in 25781249.

It is not a de Polignac number, because 25781249 - 2¹² = 25777153 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 (25781219) 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, 14102 + ... + 15824.

It is an arithmetic number, because the mean of its divisors is an integer number (3475584).

Almost surely, 2^25781249 is an apocalyptic number.

It is an amenable number.

25781249 is a deficient number, since it is larger than the sum of its proper divisors (2023423).

25781249 is a wasteful number, since it uses less digits than its factorization.

25781249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2887.

The product of its digits is 40320, while the sum is 38.

The square root of 25781249 is about 5077.5239044243. The cubic root of 25781249 is about 295.4164337973.

The spelling of 25781249 in words is "twenty-five million, seven hundred eighty-one thousand, two hundred forty-nine".