82021187 has 4 divisors (see below), whose sum is σ = 82062576. Its totient is φ = 81979800.

The previous prime is 82021183. The next prime is 82021207. The reversal of 82021187 is 78112028.

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 82021187 - 2² = 82021183 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (82021183) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17564 + ... + 21737.

It is an arithmetic number, because the mean of its divisors is an integer number (20515644).

Almost surely, 2^82021187 is an apocalyptic number.

82021187 is a deficient number, since it is larger than the sum of its proper divisors (41389).

82021187 is a wasteful number, since it uses less digits than its factorization.

82021187 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41388.

The product of its (nonzero) digits is 1792, while the sum is 29.

The square root of 82021187 is about 9056.5549189523. The cubic root of 82021187 is about 434.4855626430.

The spelling of 82021187 in words is "eighty-two million, twenty-one thousand, one hundred eighty-seven".