25842181 has 2 divisors, whose sum is σ = 25842182. Its totient is φ = 25842180.

The previous prime is 25842143. The next prime is 25842191. The reversal of 25842181 is 18124852.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14753281 + 11088900 = 3841^2 + 3330^2 .

It is a cyclic number.

It is not a de Polignac number, because 25842181 - 2⁷ = 25842053 is a prime.

It is a super-2 number, since 2×25842181² = 1335636637673522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25842191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12921090 + 12921091.

It is an arithmetic number, because the mean of its divisors is an integer number (12921091).

Almost surely, 2^25842181 is an apocalyptic number.

It is an amenable number.

25842181 is a deficient number, since it is larger than the sum of its proper divisors (1).

25842181 is an equidigital number, since it uses as much as digits as its factorization.

25842181 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5120, while the sum is 31.

The square root of 25842181 is about 5083.5205320722. The cubic root of 25842181 is about 295.6489820336.

The spelling of 25842181 in words is "twenty-five million, eight hundred forty-two thousand, one hundred eighty-one".