82021969 has 4 divisors (see below), whose sum is σ = 83177280. Its totient is φ = 80866660.

The previous prime is 82021949. The next prime is 82022023. The reversal of 82021969 is 96912028.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 82021969 - 2⁵ = 82021937 is a prime.

It is a super-2 number, since 2×82021969² = 13455206797273922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (82021949) 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, 577549 + ... + 577690.

It is an arithmetic number, because the mean of its divisors is an integer number (20794320).

Almost surely, 2^82021969 is an apocalyptic number.

It is an amenable number.

82021969 is a deficient number, since it is larger than the sum of its proper divisors (1155311).

82021969 is a wasteful number, since it uses less digits than its factorization.

82021969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1155310.

The product of its (nonzero) digits is 15552, while the sum is 37.

The square root of 82021969 is about 9056.5980919990. The cubic root of 82021969 is about 434.4869434514.

The spelling of 82021969 in words is "eighty-two million, twenty-one thousand, nine hundred sixty-nine".