25651249 has 16 divisors (see below), whose sum is σ = 30049488. Its totient is φ = 21676032.

The previous prime is 25651247. The next prime is 25651259. The reversal of 25651249 is 94215652.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 7118224 + 18533025 = 2668^2 + 4305^2 .

It is a 4-Lehmer number, since φ(25651249) divides (25651249-1)⁴.

It is a cyclic number.

It is not a de Polignac number, because 25651249 - 2¹ = 25651247 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25651243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6609 + ... + 9745.

It is an arithmetic number, because the mean of its divisors is an integer number (1878093).

Almost surely, 2^25651249 is an apocalyptic number.

It is an amenable number.

25651249 is a deficient number, since it is larger than the sum of its proper divisors (4398239).

25651249 is a wasteful number, since it uses less digits than its factorization.

25651249 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3204.

The product of its digits is 21600, while the sum is 34.

The square root of 25651249 is about 5064.7062106306. The cubic root of 25651249 is about 294.9190585174.

It can be divided in two parts, 25 and 651249, that multiplied together give a square (16281225 = 4035²).

The spelling of 25651249 in words is "twenty-five million, six hundred fifty-one thousand, two hundred forty-nine".