181090849 has 3 divisors (see below), whose sum is σ = 181104307. Its totient is φ = 181077392.

The previous prime is 181090841. The next prime is 181090867. The reversal of 181090849 is 948090181.

The square root of 181090849 is 13457.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 181037025 + 53824 = 13455^2 + 232^2 .

It is not a de Polignac number, because 181090849 - 2³ = 181090841 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (181090841) 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 in 2 ways as a sum of consecutive naturals, for example, 6729 + ... + 20185.

Almost surely, 2^181090849 is an apocalyptic number.

181090849 is the 13457-th square number.

181090849 is the 6729-th centered octagonal number.

It is an amenable number.

181090849 is a deficient number, since it is larger than the sum of its proper divisors (13458).

181090849 is an frugal number, since it uses more digits than its factorization.

181090849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26914 (or 13457 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 40.

The cubic root of 181090849 is about 565.7599078670.

Multiplying 181090849 by its product of nonzero digits (20736), we get a square (3755099844864 = 1937808²).

The spelling of 181090849 in words is "one hundred eighty-one million, ninety thousand, eight hundred forty-nine".