25449257 has 6 divisors (see below), whose sum is σ = 25694634. Its totient is φ = 25204880.

The previous prime is 25449253. The next prime is 25449299. The reversal of 25449257 is 75294452.

It can be written as a sum of positive squares in only one way, i.e., 22477081 + 2972176 = 4741^2 + 1724^2 .

It is not a de Polignac number, because 25449257 - 2² = 25449253 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 25449257.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25449251) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 58832 + ... + 59262.

It is an arithmetic number, because the mean of its divisors is an integer number (4282439).

Almost surely, 2^25449257 is an apocalyptic number.

It is an amenable number.

25449257 is a deficient number, since it is larger than the sum of its proper divisors (245377).

25449257 is an frugal number, since it uses more digits than its factorization.

25449257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 999 (or 568 counting only the distinct ones).

The product of its digits is 100800, while the sum is 38.

The square root of 25449257 is about 5044.7256615202. The cubic root of 25449257 is about 294.1428995110.

The spelling of 25449257 in words is "twenty-five million, four hundred forty-nine thousand, two hundred fifty-seven".