25128869 has 2 divisors, whose sum is σ = 25128870. Its totient is φ = 25128868.

The previous prime is 25128853. The next prime is 25128881. The reversal of 25128869 is 96882152.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15288100 + 9840769 = 3910^2 + 3137^2 .

It is a cyclic number.

It is not a de Polignac number, because 25128869 - 2⁴ = 25128853 is a prime.

It is a super-2 number, since 2×25128869² = 1262920114438322, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25118869) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12564434 + 12564435.

It is an arithmetic number, because the mean of its divisors is an integer number (12564435).

Almost surely, 2^25128869 is an apocalyptic number.

It is an amenable number.

25128869 is a deficient number, since it is larger than the sum of its proper divisors (1).

25128869 is an equidigital number, since it uses as much as digits as its factorization.

25128869 is an evil number, because the sum of its binary digits is even.

The product of its digits is 69120, while the sum is 41.

The square root of 25128869 is about 5012.8703354465. The cubic root of 25128869 is about 292.9033333222.

The spelling of 25128869 in words is "twenty-five million, one hundred twenty-eight thousand, eight hundred sixty-nine".