181836961 has 4 divisors (see below), whose sum is σ = 183505300. Its totient is φ = 180168624.

The previous prime is 181836959. The next prime is 181836983. The reversal of 181836961 is 169638181.

It is a happy number.

181836961 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 57380625 + 124456336 = 7575^2 + 11156^2 .

It is a cyclic number.

It is not a de Polignac number, because 181836961 - 2¹ = 181836959 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (181836911) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 834006 + ... + 834223.

It is an arithmetic number, because the mean of its divisors is an integer number (45876325).

Almost surely, 2^181836961 is an apocalyptic number.

It is an amenable number.

181836961 is a deficient number, since it is larger than the sum of its proper divisors (1668339).

181836961 is a wasteful number, since it uses less digits than its factorization.

181836961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1668338.

The product of its digits is 62208, while the sum is 43.

The square root of 181836961 is about 13484.6935819840. The cubic root of 181836961 is about 566.5358385789.

Adding to 181836961 its product of digits (62208), we get a square (181899169 = 13487²).

The spelling of 181836961 in words is "one hundred eighty-one million, eight hundred thirty-six thousand, nine hundred sixty-one".