181225199 has 2 divisors, whose sum is σ = 181225200. Its totient is φ = 181225198.

The previous prime is 181225189. The next prime is 181225229. The reversal of 181225199 is 991522181.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 181225199 - 2¹⁶ = 181159663 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (181225159) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 90612599 + 90612600.

It is an arithmetic number, because the mean of its divisors is an integer number (90612600).

Almost surely, 2^181225199 is an apocalyptic number.

181225199 is a deficient number, since it is larger than the sum of its proper divisors (1).

181225199 is an equidigital number, since it uses as much as digits as its factorization.

181225199 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12960, while the sum is 38.

The square root of 181225199 is about 13461.9909003089. The cubic root of 181225199 is about 565.8997843521.

The spelling of 181225199 in words is "one hundred eighty-one million, two hundred twenty-five thousand, one hundred ninety-nine".