81982333 has 8 divisors (see below), whose sum is σ = 85383000. Its totient is φ = 78619968.

The previous prime is 81982331. The next prime is 81982367. The reversal of 81982333 is 33328918.

It can be written as a sum of positive squares in 4 ways, for example, as 1036324 + 80946009 = 1018^2 + 8997^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 81982333 - 2¹ = 81982331 is a prime.

It is a super-2 number, since 2×81982333² = 13442205848245778, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 81982292 and 81982301.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81982331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5166 + ... + 13807.

It is an arithmetic number, because the mean of its divisors is an integer number (10672875).

Almost surely, 2^81982333 is an apocalyptic number.

It is an amenable number.

81982333 is a deficient number, since it is larger than the sum of its proper divisors (3400667).

81982333 is a wasteful number, since it uses less digits than its factorization.

81982333 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19151.

The product of its digits is 31104, while the sum is 37.

The square root of 81982333 is about 9054.4095887032. The cubic root of 81982333 is about 434.4169455414.

The spelling of 81982333 in words is "eighty-one million, nine hundred eighty-two thousand, three hundred thirty-three".