181404474209 has 16 divisors (see below), whose sum is σ = 207724124160. Its totient is φ = 155186235600.

The previous prime is 181404474197. The next prime is 181404474241. The reversal of 181404474209 is 902474404181.

It is a cyclic number.

It is not a de Polignac number, because 181404474209 - 2²⁰ = 181403425633 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 181404474209.

It is not an unprimeable number, because it can be changed into a prime (181404474299) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11232062 + ... + 11248200.

It is an arithmetic number, because the mean of its divisors is an integer number (12982757760).

Almost surely, 2^181404474209 is an apocalyptic number.

It is an amenable number.

181404474209 is a deficient number, since it is larger than the sum of its proper divisors (26319649951).

181404474209 is a wasteful number, since it uses less digits than its factorization.

181404474209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19180.

The product of its (nonzero) digits is 258048, while the sum is 44.

The spelling of 181404474209 in words is "one hundred eighty-one billion, four hundred four million, four hundred seventy-four thousand, two hundred nine".