83918181 has 4 divisors (see below), whose sum is σ = 111890912. Its totient is φ = 55945452.

The previous prime is 83918179. The next prime is 83918201. The reversal of 83918181 is 18181938.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 83918181 - 2¹ = 83918179 is a prime.

It is a super-2 number, since 2×83918181² = 14084522204697522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (83918111) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13986361 + ... + 13986366.

It is an arithmetic number, because the mean of its divisors is an integer number (27972728).

Almost surely, 2^83918181 is an apocalyptic number.

It is an amenable number.

83918181 is a deficient number, since it is larger than the sum of its proper divisors (27972731).

83918181 is a wasteful number, since it uses less digits than its factorization.

83918181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27972730.

The product of its digits is 13824, while the sum is 39.

The square root of 83918181 is about 9160.6867100671. The cubic root of 83918181 is about 437.8096741948.

The spelling of 83918181 in words is "eighty-three million, nine hundred eighteen thousand, one hundred eighty-one".