9181181 has 2 divisors, whose sum is σ = 9181182. Its totient is φ = 9181180.

The previous prime is 9181141. The next prime is 9181187. The reversal of 9181181 is 1811819.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8940100 + 241081 = 2990^2 + 491^2 .

It is an emirp because it is prime and its reverse (1811819) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9181181 is a prime.

It is a super-2 number, since 2×9181181² = 168588169109522, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9181187) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4590590 + 4590591.

It is an arithmetic number, because the mean of its divisors is an integer number (4590591).

Almost surely, 2^9181181 is an apocalyptic number.

It is an amenable number.

9181181 is a deficient number, since it is larger than the sum of its proper divisors (1).

9181181 is an equidigital number, since it uses as much as digits as its factorization.

9181181 is an evil number, because the sum of its binary digits is even.

The product of its digits is 576, while the sum is 29.

The square root of 9181181 is about 3030.0463692822. The cubic root of 9181181 is about 209.3949401370.

The spelling of 9181181 in words is "nine million, one hundred eighty-one thousand, one hundred eighty-one".