25000861 has 2 divisors, whose sum is σ = 25000862. Its totient is φ = 25000860.

The previous prime is 25000853. The next prime is 25000867. The reversal of 25000861 is 16800052.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15452761 + 9548100 = 3931^2 + 3090^2 .

It is a cyclic number.

It is not a de Polignac number, because 25000861 - 2³ = 25000853 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25000867) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12500430 + 12500431.

It is an arithmetic number, because the mean of its divisors is an integer number (12500431).

Almost surely, 2^25000861 is an apocalyptic number.

It is an amenable number.

25000861 is a deficient number, since it is larger than the sum of its proper divisors (1).

25000861 is an equidigital number, since it uses as much as digits as its factorization.

25000861 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 480, while the sum is 22.

The square root of 25000861 is about 5000.0860992587. The cubic root of 25000861 is about 292.4051305551.

The spelling of 25000861 in words is "twenty-five million, eight hundred sixty-one", and thus it is an aban number.