25705251 has 24 divisors (see below), whose sum is σ = 43623216. Its totient is φ = 14379840.

The previous prime is 25705249. The next prime is 25705261. The reversal of 25705251 is 15250752.

It is a happy number.

It is not a de Polignac number, because 25705251 - 2¹ = 25705249 is a prime.

It is not an unprimeable number, because it can be changed into a prime (25705261) 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 23 ways as a sum of consecutive naturals, for example, 8700 + ... + 11273.

It is an arithmetic number, because the mean of its divisors is an integer number (1817634).

Almost surely, 2^25705251 is an apocalyptic number.

25705251 is a deficient number, since it is larger than the sum of its proper divisors (17917965).

25705251 is a wasteful number, since it uses less digits than its factorization.

25705251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20003 (or 20000 counting only the distinct ones).

The product of its (nonzero) digits is 3500, while the sum is 27.

The square root of 25705251 is about 5070.0346152664. The cubic root of 25705251 is about 295.1258717852.

The spelling of 25705251 in words is "twenty-five million, seven hundred five thousand, two hundred fifty-one".