82021489 has 16 divisors (see below), whose sum is σ = 92630016. Its totient is φ = 71971200.

The previous prime is 82021487. The next prime is 82021493. The reversal of 82021489 is 98412028.

It is a cyclic number.

It is not a de Polignac number, because 82021489 - 2¹ = 82021487 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (82021487) 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 15 ways as a sum of consecutive naturals, for example, 55024 + ... + 56494.

It is an arithmetic number, because the mean of its divisors is an integer number (5789376).

Almost surely, 2^82021489 is an apocalyptic number.

It is an amenable number.

82021489 is a deficient number, since it is larger than the sum of its proper divisors (10608527).

82021489 is a wasteful number, since it uses less digits than its factorization.

82021489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1656.

The product of its (nonzero) digits is 9216, while the sum is 34.

The square root of 82021489 is about 9056.5715919436. The cubic root of 82021489 is about 434.4860958974.

The spelling of 82021489 in words is "eighty-two million, twenty-one thousand, four hundred eighty-nine".