181813113 has 16 divisors (see below), whose sum is σ = 285197760. Its totient is φ = 114078528.

The previous prime is 181813103. The next prime is 181813117. The reversal of 181813113 is 311318181.

It is not a de Polignac number, because 181813113 - 2⁴ = 181813097 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (181813117) 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, 197595 + ... + 198512.

It is an arithmetic number, because the mean of its divisors is an integer number (17824860).

Almost surely, 2^181813113 is an apocalyptic number.

It is an amenable number.

181813113 is a deficient number, since it is larger than the sum of its proper divisors (103384647).

181813113 is a wasteful number, since it uses less digits than its factorization.

181813113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 396133 (or 396127 counting only the distinct ones).

The product of its digits is 576, while the sum is 27.

The square root of 181813113 is about 13483.8092911462. The cubic root of 181813113 is about 566.5110703519.

The spelling of 181813113 in words is "one hundred eighty-one million, eight hundred thirteen thousand, one hundred thirteen".