82229681 has 4 divisors (see below), whose sum is σ = 83153700. Its totient is φ = 81305664.

The previous prime is 82229671. The next prime is 82229687. The reversal of 82229681 is 18692228.

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 21077281 + 61152400 = 4591^2 + 7820^2 .

It is a cyclic number.

It is not a de Polignac number, because 82229681 - 2²⁶ = 15120817 is a prime.

It is a super-2 number, since 2×82229681² = 13523440874723522, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (82229687) 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, 461876 + ... + 462053.

It is an arithmetic number, because the mean of its divisors is an integer number (20788425).

Almost surely, 2^82229681 is an apocalyptic number.

It is an amenable number.

82229681 is a deficient number, since it is larger than the sum of its proper divisors (924019).

82229681 is an equidigital number, since it uses as much as digits as its factorization.

82229681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 924018.

The product of its digits is 27648, while the sum is 38.

The square root of 82229681 is about 9068.0582816830. The cubic root of 82229681 is about 434.8533984341.

It can be divided in two parts, 822 and 29681, that added together give a palindrome (30503).

The spelling of 82229681 in words is "eighty-two million, two hundred twenty-nine thousand, six hundred eighty-one".