25705249 has 2 divisors, whose sum is σ = 25705250. Its totient is φ = 25705248.

The previous prime is 25705219. The next prime is 25705261. The reversal of 25705249 is 94250752.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24324624 + 1380625 = 4932^2 + 1175^2 .

It is a cyclic number.

It is not a de Polignac number, because 25705249 - 2⁹ = 25704737 is a prime.

It is not a weakly prime, because it can be changed into another prime (25705219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12852624 + 12852625.

It is an arithmetic number, because the mean of its divisors is an integer number (12852625).

Almost surely, 2^25705249 is an apocalyptic number.

It is an amenable number.

25705249 is a deficient number, since it is larger than the sum of its proper divisors (1).

25705249 is an equidigital number, since it uses as much as digits as its factorization.

25705249 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 25200, while the sum is 34.

The square root of 25705249 is about 5070.0344180291. The cubic root of 25705249 is about 295.1258641311.

The spelling of 25705249 in words is "twenty-five million, seven hundred five thousand, two hundred forty-nine".