25689869 has 2 divisors, whose sum is σ = 25689870. Its totient is φ = 25689868.

The previous prime is 25689809. The next prime is 25689887. The reversal of 25689869 is 96898652.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24157225 + 1532644 = 4915^2 + 1238^2 .

It is a cyclic number.

It is not a de Polignac number, because 25689869 - 2⁸ = 25689613 is a prime.

It is a super-2 number, since 2×25689869² = 1319938738474322, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 25689869.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25689809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12844934 + 12844935.

It is an arithmetic number, because the mean of its divisors is an integer number (12844935).

Almost surely, 2^25689869 is an apocalyptic number.

It is an amenable number.

25689869 is a deficient number, since it is larger than the sum of its proper divisors (1).

25689869 is an equidigital number, since it uses as much as digits as its factorization.

25689869 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1866240, while the sum is 53.

The square root of 25689869 is about 5068.5174360951. The cubic root of 25689869 is about 295.0669923502.

The spelling of 25689869 in words is "twenty-five million, six hundred eighty-nine thousand, eight hundred sixty-nine".