25923991 has 2 divisors, whose sum is σ = 25923992. Its totient is φ = 25923990.

The previous prime is 25923977. The next prime is 25924007. The reversal of 25923991 is 19932952.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25923991 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 (25923901) 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, 12961995 + 12961996.

It is an arithmetic number, because the mean of its divisors is an integer number (12961996).

Almost surely, 2^25923991 is an apocalyptic number.

25923991 is a deficient number, since it is larger than the sum of its proper divisors (1).

25923991 is an equidigital number, since it uses as much as digits as its factorization.

25923991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 43740, while the sum is 40.

The square root of 25923991 is about 5091.5607626739. The cubic root of 25923991 is about 295.9606374185.

The spelling of 25923991 in words is "twenty-five million, nine hundred twenty-three thousand, nine hundred ninety-one".