82299521 has 4 divisors (see below), whose sum is σ = 82388292. Its totient is φ = 82210752.

The previous prime is 82299493. The next prime is 82299523. The reversal of 82299521 is 12599228.

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

It can be written as a sum of positive squares in 2 ways, for example, as 26214400 + 56085121 = 5120^2 + 7489^2 .

It is a cyclic number.

It is not a de Polignac number, because 82299521 - 2¹⁴ = 82283137 is a prime.

It is a super-2 number, since 2×82299521² = 13546422313658882, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (82299523) 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, 42980 + ... + 44853.

It is an arithmetic number, because the mean of its divisors is an integer number (20597073).

Almost surely, 2^82299521 is an apocalyptic number.

It is an amenable number.

82299521 is a deficient number, since it is larger than the sum of its proper divisors (88771).

82299521 is an equidigital number, since it uses as much as digits as its factorization.

82299521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88770.

The product of its digits is 25920, while the sum is 38.

The square root of 82299521 is about 9071.9083438933. The cubic root of 82299521 is about 434.9764747043.

The spelling of 82299521 in words is "eighty-two million, two hundred ninety-nine thousand, five hundred twenty-one".