82861199 has 4 divisors (see below), whose sum is σ = 82884936. Its totient is φ = 82837464.

The previous prime is 82861187. The next prime is 82861217. The reversal of 82861199 is 99116828.

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

It is a cyclic number.

It is not a de Polignac number, because 82861199 - 2²⁰ = 81812623 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 (82861159) 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, 5489 + ... + 13994.

It is an arithmetic number, because the mean of its divisors is an integer number (20721234).

Almost surely, 2^82861199 is an apocalyptic number.

82861199 is a deficient number, since it is larger than the sum of its proper divisors (23737).

82861199 is a wasteful number, since it uses less digits than its factorization.

82861199 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23736.

The product of its digits is 62208, while the sum is 44.

The square root of 82861199 is about 9102.8126971832. The cubic root of 82861199 is about 435.9637749411.

The spelling of 82861199 in words is "eighty-two million, eight hundred sixty-one thousand, one hundred ninety-nine".