25117861 has 2 divisors, whose sum is σ = 25117862. Its totient is φ = 25117860.

The previous prime is 25117853. The next prime is 25117877. The reversal of 25117861 is 16871152.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24750625 + 367236 = 4975^2 + 606^2 .

It is a cyclic number.

It is not a de Polignac number, because 25117861 - 2³ = 25117853 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25117801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12558930 + 12558931.

It is an arithmetic number, because the mean of its divisors is an integer number (12558931).

Almost surely, 2^25117861 is an apocalyptic number.

It is an amenable number.

25117861 is a deficient number, since it is larger than the sum of its proper divisors (1).

25117861 is an equidigital number, since it uses as much as digits as its factorization.

25117861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3360, while the sum is 31.

The square root of 25117861 is about 5011.7722414332. The cubic root of 25117861 is about 292.8605571455.

The spelling of 25117861 in words is "twenty-five million, one hundred seventeen thousand, eight hundred sixty-one".