25716109 has 2 divisors, whose sum is σ = 25716110. Its totient is φ = 25716108.

The previous prime is 25716091. The next prime is 25716167. The reversal of 25716109 is 90161752.

Together with previous prime (25716091) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17892900 + 7823209 = 4230^2 + 2797^2 .

It is a cyclic number.

It is not a de Polignac number, because 25716109 - 2¹¹ = 25714061 is a prime.

It is a super-2 number, since 2×25716109² = 1322636524199762, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25716169) 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, 12858054 + 12858055.

It is an arithmetic number, because the mean of its divisors is an integer number (12858055).

Almost surely, 2^25716109 is an apocalyptic number.

It is an amenable number.

25716109 is a deficient number, since it is larger than the sum of its proper divisors (1).

25716109 is an equidigital number, since it uses as much as digits as its factorization.

25716109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3780, while the sum is 31.

The square root of 25716109 is about 5071.1053035803. The cubic root of 25716109 is about 295.1674200487.

The spelling of 25716109 in words is "twenty-five million, seven hundred sixteen thousand, one hundred nine".