82115189 has 4 divisors (see below), whose sum is σ = 88431756. Its totient is φ = 75798624.

The previous prime is 82115183. The next prime is 82115191. The reversal of 82115189 is 98151128.

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 18992164 + 63123025 = 4358^2 + 7945^2 .

It is a cyclic number.

It is not a de Polignac number, because 82115189 - 2²⁴ = 65337973 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 (82115183) 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, 3158264 + ... + 3158289.

It is an arithmetic number, because the mean of its divisors is an integer number (22107939).

Almost surely, 2^82115189 is an apocalyptic number.

It is an amenable number.

82115189 is a deficient number, since it is larger than the sum of its proper divisors (6316567).

82115189 is a wasteful number, since it uses less digits than its factorization.

82115189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6316566.

The product of its digits is 5760, while the sum is 35.

The square root of 82115189 is about 9061.7431546033. The cubic root of 82115189 is about 434.6514828582.

The spelling of 82115189 in words is "eighty-two million, one hundred fifteen thousand, one hundred eighty-nine".