181145509 has 8 divisors (see below), whose sum is σ = 182407680. Its totient is φ = 179888016.

The previous prime is 181145453. The next prime is 181145537. The reversal of 181145509 is 905541181.

181145509 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 181145509 - 2⁷ = 181145381 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (181145609) 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, 109839 + ... + 111475.

It is an arithmetic number, because the mean of its divisors is an integer number (22800960).

Almost surely, 2^181145509 is an apocalyptic number.

It is an amenable number.

181145509 is a deficient number, since it is larger than the sum of its proper divisors (1262171).

181145509 is a wasteful number, since it uses less digits than its factorization.

181145509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2339.

The product of its (nonzero) digits is 7200, while the sum is 34.

The square root of 181145509 is about 13459.0307600510. The cubic root of 181145509 is about 565.8168246501.

The spelling of 181145509 in words is "one hundred eighty-one million, one hundred forty-five thousand, five hundred nine".