82169999 has 4 divisors (see below), whose sum is σ = 82347936. Its totient is φ = 81992064.

The previous prime is 82169987. The next prime is 82170019. The reversal of 82169999 is 99996128.

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 82169999 - 2²⁰ = 81121423 is a prime.

It is a Duffinian number.

82169999 is a modest number, since divided by 9999 gives 8216 as remainder.

It is a self number, because there is not a number n which added to its sum of digits gives 82169999.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82169929) 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, 88274 + ... + 89199.

It is an arithmetic number, because the mean of its divisors is an integer number (20586984).

Almost surely, 2^82169999 is an apocalyptic number.

82169999 is a deficient number, since it is larger than the sum of its proper divisors (177937).

82169999 is a wasteful number, since it uses less digits than its factorization.

82169999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 177936.

The product of its digits is 629856, while the sum is 53.

The square root of 82169999 is about 9064.7669026843. The cubic root of 82169999 is about 434.7481679723.

The spelling of 82169999 in words is "eighty-two million, one hundred sixty-nine thousand, nine hundred ninety-nine".