83921117069 has 4 divisors (see below), whose sum is σ = 83921724444. Its totient is φ = 83920509696.

The previous prime is 83921117047. The next prime is 83921117099. The reversal of 83921117069 is 96071112938.

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 can be written as a sum of positive squares in 2 ways, for example, as 74836167844 + 9084949225 = 273562^2 + 95315^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-83921117069 is a prime.

It is a super-2 number, since 2×83921117069² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (83921117099) 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 3 ways as a sum of consecutive naturals, for example, 15149 + ... + 409965.

It is an arithmetic number, because the mean of its divisors is an integer number (20980431111).

Almost surely, 2^83921117069 is an apocalyptic number.

It is an amenable number.

83921117069 is a deficient number, since it is larger than the sum of its proper divisors (607375).

83921117069 is a wasteful number, since it uses less digits than its factorization.

83921117069 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 607374.

The product of its (nonzero) digits is 163296, while the sum is 47.

The spelling of 83921117069 in words is "eighty-three billion, nine hundred twenty-one million, one hundred seventeen thousand, sixty-nine".