83789991 has 16 divisors (see below), whose sum is σ = 131436000. Its totient is φ = 52573824.

The previous prime is 83789983. The next prime is 83790017. The reversal of 83789991 is 19998738.

It is not a de Polignac number, because 83789991 - 2³ = 83789983 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (83789191) 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, 90816 + ... + 91733.

It is an arithmetic number, because the mean of its divisors is an integer number (8214750).

Almost surely, 2^83789991 is an apocalyptic number.

83789991 is a deficient number, since it is larger than the sum of its proper divisors (47646009).

83789991 is a wasteful number, since it uses less digits than its factorization.

83789991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 182575 (or 182569 counting only the distinct ones).

The product of its digits is 979776, while the sum is 54.

The square root of 83789991 is about 9153.6872898303. The cubic root of 83789991 is about 437.5866338368.

The spelling of 83789991 in words is "eighty-three million, seven hundred eighty-nine thousand, nine hundred ninety-one".