1149817181 has 2 divisors, whose sum is σ = 1149817182. Its totient is φ = 1149817180.

The previous prime is 1149817157. The next prime is 1149817183. The reversal of 1149817181 is 1817189411.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1009015225 + 140801956 = 31765^2 + 11866^2 .

It is an emirp because it is prime and its reverse (1817189411) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1149817181 - 2¹⁸ = 1149555037 is a prime.

It is a super-2 number, since 2×1149817181² = 2644159099445573522, which contains 22 as substring.

Together with 1149817183, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1149817183) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 574908590 + 574908591.

It is an arithmetic number, because the mean of its divisors is an integer number (574908591).

Almost surely, 2^1149817181 is an apocalyptic number.

It is an amenable number.

1149817181 is a deficient number, since it is larger than the sum of its proper divisors (1).

1149817181 is an equidigital number, since it uses as much as digits as its factorization.

1149817181 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16128, while the sum is 41.

The square root of 1149817181 is about 33908.9542893909. The cubic root of 1149817181 is about 1047.6340320971.

The spelling of 1149817181 in words is "one billion, one hundred forty-nine million, eight hundred seventeen thousand, one hundred eighty-one".