25979813 has 2 divisors, whose sum is σ = 25979814. Its totient is φ = 25979812.

The previous prime is 25979771. The next prime is 25979827. The reversal of 25979813 is 31897952.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19918369 + 6061444 = 4463^2 + 2462^2 .

It is a cyclic number.

It is not a de Polignac number, because 25979813 - 2⁶ = 25979749 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25979843) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12989906 + 12989907.

It is an arithmetic number, because the mean of its divisors is an integer number (12989907).

Almost surely, 2^25979813 is an apocalyptic number.

It is an amenable number.

25979813 is a deficient number, since it is larger than the sum of its proper divisors (1).

25979813 is an equidigital number, since it uses as much as digits as its factorization.

25979813 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 136080, while the sum is 44.

The square root of 25979813 is about 5097.0396310015. The cubic root of 25979813 is about 296.1729153119.

The spelling of 25979813 in words is "twenty-five million, nine hundred seventy-nine thousand, eight hundred thirteen".