181209099 has 8 divisors (see below), whose sum is σ = 254328640. Its totient is φ = 114447816.

The previous prime is 181209079. The next prime is 181209109. The reversal of 181209099 is 990902181.

It is a happy number.

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

It is not a de Polignac number, because 181209099 - 2¹³ = 181200907 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (181209059) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1589497 + ... + 1589610.

It is an arithmetic number, because the mean of its divisors is an integer number (31791080).

Almost surely, 2^181209099 is an apocalyptic number.

181209099 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

181209099 is a deficient number, since it is larger than the sum of its proper divisors (73119541).

181209099 is a wasteful number, since it uses less digits than its factorization.

181209099 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3179129.

The product of its (nonzero) digits is 11664, while the sum is 39.

The square root of 181209099 is about 13461.3929071252. The cubic root of 181209099 is about 565.8830257254.

The spelling of 181209099 in words is "one hundred eighty-one million, two hundred nine thousand, ninety-nine".