25261109 has 2 divisors, whose sum is σ = 25261110. Its totient is φ = 25261108.

The previous prime is 25261097. The next prime is 25261111. The reversal of 25261109 is 90116252.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13032100 + 12229009 = 3610^2 + 3497^2 .

It is a cyclic number.

It is not a de Polignac number, because 25261109 - 2²⁰ = 24212533 is a prime.

Together with 25261111, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25261129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12630554 + 12630555.

It is an arithmetic number, because the mean of its divisors is an integer number (12630555).

Almost surely, 2^25261109 is an apocalyptic number.

It is an amenable number.

25261109 is a deficient number, since it is larger than the sum of its proper divisors (1).

25261109 is an equidigital number, since it uses as much as digits as its factorization.

25261109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1080, while the sum is 26.

The square root of 25261109 is about 5026.0430758202. The cubic root of 25261109 is about 293.4162333127.

The spelling of 25261109 in words is "twenty-five million, two hundred sixty-one thousand, one hundred nine".