83989121 has 4 divisors (see below), whose sum is σ = 84092244. Its totient is φ = 83886000.

The previous prime is 83989117. The next prime is 83989151. The reversal of 83989121 is 12198938.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 20611600 + 63377521 = 4540^2 + 7961^2 .

It is a cyclic number.

It is not a de Polignac number, because 83989121 - 2² = 83989117 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (83989151) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 50330 + ... + 51971.

It is an arithmetic number, because the mean of its divisors is an integer number (21023061).

Almost surely, 2^83989121 is an apocalyptic number.

It is an amenable number.

83989121 is a deficient number, since it is larger than the sum of its proper divisors (103123).

83989121 is a wasteful number, since it uses less digits than its factorization.

83989121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103122.

The product of its digits is 31104, while the sum is 41.

The square root of 83989121 is about 9164.5578725872. The cubic root of 83989121 is about 437.9330065103.

The spelling of 83989121 in words is "eighty-three million, nine hundred eighty-nine thousand, one hundred twenty-one".