25808929 has 2 divisors, whose sum is σ = 25808930. Its totient is φ = 25808928.

The previous prime is 25808903. The next prime is 25808947. The reversal of 25808929 is 92980852.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25522704 + 286225 = 5052^2 + 535^2 .

It is a cyclic number.

It is not a de Polignac number, because 25808929 - 2⁷ = 25808801 is a prime.

It is a super-2 number, since 2×25808929² = 1332201632254082, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (25802929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12904464 + 12904465.

It is an arithmetic number, because the mean of its divisors is an integer number (12904465).

Almost surely, 2^25808929 is an apocalyptic number.

It is an amenable number.

25808929 is a deficient number, since it is larger than the sum of its proper divisors (1).

25808929 is an equidigital number, since it uses as much as digits as its factorization.

25808929 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 103680, while the sum is 43.

The square root of 25808929 is about 5080.2489112247. The cubic root of 25808929 is about 295.5221204559.

The spelling of 25808929 in words is "twenty-five million, eight hundred eight thousand, nine hundred twenty-nine".