181163405 has 4 divisors (see below), whose sum is σ = 217396092. Its totient is φ = 144930720.

The previous prime is 181163401. The next prime is 181163413. The reversal of 181163405 is 504361181.

181163405 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 114789796 + 66373609 = 10714^2 + 8147^2 .

It is not a de Polignac number, because 181163405 - 2² = 181163401 is a prime.

It is a super-2 number, since 2×181163405² = 65640358622388050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (181163401) 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, 18116336 + ... + 18116345.

It is an arithmetic number, because the mean of its divisors is an integer number (54349023).

Almost surely, 2^181163405 is an apocalyptic number.

It is an amenable number.

181163405 is a deficient number, since it is larger than the sum of its proper divisors (36232687).

181163405 is an equidigital number, since it uses as much as digits as its factorization.

181163405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36232686.

The product of its (nonzero) digits is 2880, while the sum is 29.

The square root of 181163405 is about 13459.6955760522. The cubic root of 181163405 is about 565.8354570459.

The spelling of 181163405 in words is "one hundred eighty-one million, one hundred sixty-three thousand, four hundred five".