181679913 has 12 divisors (see below), whose sum is σ = 263527680. Its totient is φ = 120611736.

The previous prime is 181679909. The next prime is 181679941. The reversal of 181679913 is 319976181.

181679913 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 181679913 - 2² = 181679909 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (181679903) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 40081 + ... + 44382.

It is an arithmetic number, because the mean of its divisors is an integer number (21960640).

Almost surely, 2^181679913 is an apocalyptic number.

It is an amenable number.

181679913 is a deficient number, since it is larger than the sum of its proper divisors (81847767).

181679913 is a wasteful number, since it uses less digits than its factorization.

181679913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84708 (or 84705 counting only the distinct ones).

The product of its digits is 81648, while the sum is 45.

The square root of 181679913 is about 13478.8691291221. The cubic root of 181679913 is about 566.3726906929.

The spelling of 181679913 in words is "one hundred eighty-one million, six hundred seventy-nine thousand, nine hundred thirteen".