83115221 has 12 divisors (see below), whose sum is σ = 97155360. Its totient is φ = 70895160.

The previous prime is 83115211. The next prime is 83115239. The reversal of 83115221 is 12251138.

It is a happy number.

It is not a de Polignac number, because 83115221 - 2¹⁰ = 83114197 is a prime.

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 (83115211) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6320 + ... + 14358.

It is an arithmetic number, because the mean of its divisors is an integer number (8096280).

Almost surely, 2^83115221 is an apocalyptic number.

It is an amenable number.

83115221 is a deficient number, since it is larger than the sum of its proper divisors (14040139).

83115221 is a wasteful number, since it uses less digits than its factorization.

83115221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8264 (or 8257 counting only the distinct ones).

The product of its digits is 480, while the sum is 23.

The square root of 83115221 is about 9116.7549599625. The cubic root of 83115221 is about 436.4088220662.

Adding to 83115221 its reverse (12251138), we get a palindrome (95366359).

The spelling of 83115221 in words is "eighty-three million, one hundred fifteen thousand, two hundred twenty-one".