25991039 has 2 divisors, whose sum is σ = 25991040. Its totient is φ = 25991038.

The previous prime is 25991029. The next prime is 25991071. The reversal of 25991039 is 93019952.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 25991039 - 2⁴ = 25991023 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 25990993 and 25991011.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25991029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12995519 + 12995520.

It is an arithmetic number, because the mean of its divisors is an integer number (12995520).

Almost surely, 2^25991039 is an apocalyptic number.

25991039 is a deficient number, since it is larger than the sum of its proper divisors (1).

25991039 is an equidigital number, since it uses as much as digits as its factorization.

25991039 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 21870, while the sum is 38.

The square root of 25991039 is about 5098.1407395246. The cubic root of 25991039 is about 296.2155684078.

The spelling of 25991039 in words is "twenty-five million, nine hundred ninety-one thousand, thirty-nine".