25222181 has 2 divisors, whose sum is σ = 25222182. Its totient is φ = 25222180.

The previous prime is 25222159. The next prime is 25222187. The reversal of 25222181 is 18122252.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17986081 + 7236100 = 4241^2 + 2690^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25222181 is a prime.

It is a super-2 number, since 2×25222181² = 1272316828793522, which contains 22 as substring.

It is a Chen prime.

It is a plaindrome in base 15.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25222187) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12611090 + 12611091.

It is an arithmetic number, because the mean of its divisors is an integer number (12611091).

Almost surely, 2^25222181 is an apocalyptic number.

It is an amenable number.

25222181 is a deficient number, since it is larger than the sum of its proper divisors (1).

25222181 is an equidigital number, since it uses as much as digits as its factorization.

25222181 is an evil number, because the sum of its binary digits is even.

The product of its digits is 640, while the sum is 23.

The square root of 25222181 is about 5022.1689537490. The cubic root of 25222181 is about 293.2654352432.

The spelling of 25222181 in words is "twenty-five million, two hundred twenty-two thousand, one hundred eighty-one".