181121081 has 2 divisors, whose sum is σ = 181121082. Its totient is φ = 181121080.

The previous prime is 181121051. The next prime is 181121093. The reversal of 181121081 is 180121181.

181121081 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 149940025 + 31181056 = 12245^2 + 5584^2 .

It is an emirp because it is prime and its reverse (180121181) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-181121081 is a prime.

It is a super-2 number, since 2×181121081² = 65609691965217122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (181121051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 90560540 + 90560541.

It is an arithmetic number, because the mean of its divisors is an integer number (90560541).

Almost surely, 2^181121081 is an apocalyptic number.

It is an amenable number.

181121081 is a deficient number, since it is larger than the sum of its proper divisors (1).

181121081 is an equidigital number, since it uses as much as digits as its factorization.

181121081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 128, while the sum is 23.

The square root of 181121081 is about 13458.1232346862. The cubic root of 181121081 is about 565.7913894906.

The spelling of 181121081 in words is "one hundred eighty-one million, one hundred twenty-one thousand, eighty-one".