25679861 has 2 divisors, whose sum is σ = 25679862. Its totient is φ = 25679860.

The previous prime is 25679851. The next prime is 25679869. The reversal of 25679861 is 16897652.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20702500 + 4977361 = 4550^2 + 2231^2 .

It is a cyclic number.

It is not a de Polignac number, because 25679861 - 2²² = 21485557 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25679869) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12839930 + 12839931.

It is an arithmetic number, because the mean of its divisors is an integer number (12839931).

Almost surely, 2^25679861 is an apocalyptic number.

It is an amenable number.

25679861 is a deficient number, since it is larger than the sum of its proper divisors (1).

25679861 is an equidigital number, since it uses as much as digits as its factorization.

25679861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 181440, while the sum is 44.

The square root of 25679861 is about 5067.5300689784. The cubic root of 25679861 is about 295.0286709661.

The spelling of 25679861 in words is "twenty-five million, six hundred seventy-nine thousand, eight hundred sixty-one".