83919891939 has 16 divisors (see below), whose sum is σ = 122197549824. Its totient is φ = 50915642400.

The previous prime is 83919891931. The next prime is 83919892019. The reversal of 83919891939 is 93919891938.

It is not a de Polignac number, because 83919891939 - 2³ = 83919891931 is a prime.

It is not an unprimeable number, because it can be changed into a prime (83919891931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15150697 + ... + 15156234.

It is an arithmetic number, because the mean of its divisors is an integer number (7637346864).

Almost surely, 2^83919891939 is an apocalyptic number.

83919891939 is a deficient number, since it is larger than the sum of its proper divisors (38277657885).

83919891939 is a wasteful number, since it uses less digits than its factorization.

83919891939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30307018.

The product of its digits is 34012224, while the sum is 69.

Subtracting 83919891939 from its reverse (93919891938), we obtain a palindrome (9999999999).

The spelling of 83919891939 in words is "eighty-three billion, nine hundred nineteen million, eight hundred ninety-one thousand, nine hundred thirty-nine".