81836339 has 4 divisors (see below), whose sum is σ = 88131456. Its totient is φ = 75541224.

The previous prime is 81836329. The next prime is 81836371. The reversal of 81836339 is 93363818.

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 81836339 - 2¹² = 81832243 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 81836296 and 81836305.

It is not an unprimeable number, because it can be changed into a prime (81836329) 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, 3147539 + ... + 3147564.

It is an arithmetic number, because the mean of its divisors is an integer number (22032864).

Almost surely, 2^81836339 is an apocalyptic number.

81836339 is a deficient number, since it is larger than the sum of its proper divisors (6295117).

81836339 is a wasteful number, since it uses less digits than its factorization.

81836339 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6295116.

The product of its digits is 93312, while the sum is 41.

The square root of 81836339 is about 9046.3439576439. The cubic root of 81836339 is about 434.1589226644.

The spelling of 81836339 in words is "eighty-one million, eight hundred thirty-six thousand, three hundred thirty-nine".