83919891 has 8 divisors (see below), whose sum is σ = 122065344. Its totient is φ = 50860520.

The previous prime is 83919853. The next prime is 83919917. The reversal of 83919891 is 19891938.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 83919891 - 2⁷ = 83919763 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 83919891.

It is not an unprimeable number, because it can be changed into a prime (83919491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1271481 + ... + 1271546.

It is an arithmetic number, because the mean of its divisors is an integer number (15258168).

Almost surely, 2^83919891 is an apocalyptic number.

83919891 is a deficient number, since it is larger than the sum of its proper divisors (38145453).

83919891 is a wasteful number, since it uses less digits than its factorization.

83919891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2543041.

The product of its digits is 139968, while the sum is 48.

The square root of 83919891 is about 9160.7800432059. The cubic root of 83919891 is about 437.8126479225.

The spelling of 83919891 in words is "eighty-three million, nine hundred nineteen thousand, eight hundred ninety-one".