83821109 has 8 divisors (see below), whose sum is σ = 85789440. Its totient is φ = 81874800.

The previous prime is 83821093. The next prime is 83821151. The reversal of 83821109 is 90112838.

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 83821109 - 2⁴ = 83821093 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 (83821159) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2324 + ... + 13154.

It is an arithmetic number, because the mean of its divisors is an integer number (10723680).

Almost surely, 2^83821109 is an apocalyptic number.

It is an amenable number.

83821109 is a deficient number, since it is larger than the sum of its proper divisors (1968331).

83821109 is a wasteful number, since it uses less digits than its factorization.

83821109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11011.

The product of its (nonzero) digits is 3456, while the sum is 32.

The square root of 83821109 is about 9155.3868842338. The cubic root of 83821109 is about 437.6407975676.

The spelling of 83821109 in words is "eighty-three million, eight hundred twenty-one thousand, one hundred nine".