181855113 has 8 divisors (see below), whose sum is σ = 264516576. Its totient is φ = 110215200.

The previous prime is 181855109. The next prime is 181855133. The reversal of 181855113 is 311558181.

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

It is not a de Polignac number, because 181855113 - 2² = 181855109 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33), and also a Moran number because the ratio is a prime number: 5510761 = 181855113 / (1 + 8 + 1 + 8 + 5 + 5 + 1 + 1 + 3).

It is not an unprimeable number, because it can be changed into a prime (181855133) 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, 2755348 + ... + 2755413.

It is an arithmetic number, because the mean of its divisors is an integer number (33064572).

Almost surely, 2^181855113 is an apocalyptic number.

It is an amenable number.

181855113 is a deficient number, since it is larger than the sum of its proper divisors (82661463).

181855113 is a wasteful number, since it uses less digits than its factorization.

181855113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5510775.

The product of its digits is 4800, while the sum is 33.

The square root of 181855113 is about 13485.3666246046. The cubic root of 181855113 is about 566.5546895618.

The spelling of 181855113 in words is "one hundred eighty-one million, eight hundred fifty-five thousand, one hundred thirteen".