83891911 has 4 divisors (see below), whose sum is σ = 83910232. Its totient is φ = 83873592.

The previous prime is 83891909. The next prime is 83891963. The reversal of 83891911 is 11919838.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 83891911 - 2¹ = 83891909 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (83891111) 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, 4405 + ... + 13681.

It is an arithmetic number, because the mean of its divisors is an integer number (20977558).

Almost surely, 2^83891911 is an apocalyptic number.

83891911 is a deficient number, since it is larger than the sum of its proper divisors (18321).

83891911 is an equidigital number, since it uses as much as digits as its factorization.

83891911 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18320.

The product of its digits is 15552, while the sum is 40.

The square root of 83891911 is about 9159.2527533637. The cubic root of 83891911 is about 437.7639850074.

The spelling of 83891911 in words is "eighty-three million, eight hundred ninety-one thousand, nine hundred eleven".