181914181 has 2 divisors, whose sum is σ = 181914182. Its totient is φ = 181914180.

The previous prime is 181914119. The next prime is 181914191. The reversal of 181914181 is 181419181.

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., 95238081 + 86676100 = 9759^2 + 9310^2 .

It is an emirp because it is prime and its reverse (181419181) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-181914181 is a prime.

It is a super-2 number, since 2×181914181² = 66185538497801522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (181914101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 90957090 + 90957091.

It is an arithmetic number, because the mean of its divisors is an integer number (90957091).

Almost surely, 2^181914181 is an apocalyptic number.

It is an amenable number.

181914181 is a deficient number, since it is larger than the sum of its proper divisors (1).

181914181 is an equidigital number, since it uses as much as digits as its factorization.

181914181 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2304, while the sum is 34.

The square root of 181914181 is about 13487.5565244413. The cubic root of 181914181 is about 566.6160234249.

The spelling of 181914181 in words is "one hundred eighty-one million, nine hundred fourteen thousand, one hundred eighty-one".