25170881 has 2 divisors, whose sum is σ = 25170882. Its totient is φ = 25170880.

The previous prime is 25170799. The next prime is 25170883. The reversal of 25170881 is 18807152.

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., 24840256 + 330625 = 4984^2 + 575^2 .

It is a cyclic number.

It is not a de Polignac number, because 25170881 - 2¹⁴ = 25154497 is a prime.

It is a super-2 number, since 2×25170881² = 1267146500632322, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 25170883, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (25170883) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12585440 + 12585441.

It is an arithmetic number, because the mean of its divisors is an integer number (12585441).

Almost surely, 2^25170881 is an apocalyptic number.

It is an amenable number.

25170881 is a deficient number, since it is larger than the sum of its proper divisors (1).

25170881 is an equidigital number, since it uses as much as digits as its factorization.

25170881 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4480, while the sum is 32.

The square root of 25170881 is about 5017.0589990551. The cubic root of 25170881 is about 293.0664737528.

The spelling of 25170881 in words is "twenty-five million, one hundred seventy thousand, eight hundred eighty-one".