81334933 has 2 divisors, whose sum is σ = 81334934. Its totient is φ = 81334932.

The previous prime is 81334931. The next prime is 81334943. The reversal of 81334933 is 33943318.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 81324324 + 10609 = 9018^2 + 103^2 .

It is a cyclic number.

It is not a de Polignac number, because 81334933 - 2¹ = 81334931 is a prime.

It is a super-2 number, since 2×81334933² = 13230742652228978, which contains 22 as substring.

Together with 81334931, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81334931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40667466 + 40667467.

It is an arithmetic number, because the mean of its divisors is an integer number (40667467).

Almost surely, 2^81334933 is an apocalyptic number.

It is an amenable number.

81334933 is a deficient number, since it is larger than the sum of its proper divisors (1).

81334933 is an equidigital number, since it uses as much as digits as its factorization.

81334933 is an evil number, because the sum of its binary digits is even.

The product of its digits is 23328, while the sum is 34.

The square root of 81334933 is about 9018.5881932817. The cubic root of 81334933 is about 433.2704176244.

The spelling of 81334933 in words is "eighty-one million, three hundred thirty-four thousand, nine hundred thirty-three".