81340333 has 2 divisors, whose sum is σ = 81340334. Its totient is φ = 81340332.

The previous prime is 81340327. The next prime is 81340367. The reversal of 81340333 is 33304318.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 73925604 + 7414729 = 8598^2 + 2723^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81340333 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 81340298 and 81340307.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81340313) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40670166 + 40670167.

It is an arithmetic number, because the mean of its divisors is an integer number (40670167).

Almost surely, 2^81340333 is an apocalyptic number.

It is an amenable number.

81340333 is a deficient number, since it is larger than the sum of its proper divisors (1).

81340333 is an equidigital number, since it uses as much as digits as its factorization.

81340333 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2592, while the sum is 25.

The square root of 81340333 is about 9018.8875699833. The cubic root of 81340333 is about 433.2800059952.

The spelling of 81340333 in words is "eighty-one million, three hundred forty thousand, three hundred thirty-three".