181156149 has 8 divisors (see below), whose sum is σ = 268379520. Its totient is φ = 120770748.

The previous prime is 181156139. The next prime is 181156187. The reversal of 181156149 is 941651181.

It is a happy number.

181156149 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 181156149 - 2⁵ = 181156117 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (181156109) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3354717 + ... + 3354770.

It is an arithmetic number, because the mean of its divisors is an integer number (33547440).

Almost surely, 2^181156149 is an apocalyptic number.

It is an amenable number.

181156149 is a deficient number, since it is larger than the sum of its proper divisors (87223371).

181156149 is an equidigital number, since it uses as much as digits as its factorization.

181156149 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6709496 (or 6709490 counting only the distinct ones).

The product of its digits is 8640, while the sum is 36.

The square root of 181156149 is about 13459.4260278810. The cubic root of 181156149 is about 565.8279026193.

The spelling of 181156149 in words is "one hundred eighty-one million, one hundred fifty-six thousand, one hundred forty-nine".