81383133 has 24 divisors (see below), whose sum is σ = 120264672. Its totient is φ = 48904128.

The previous prime is 81383119. The next prime is 81383147. The reversal of 81383133 is 33138318.

It is an interprime number because it is at equal distance from previous prime (81383119) and next prime (81383147).

It is not a de Polignac number, because 81383133 - 2⁴ = 81383117 is a prime.

It is a hoax number, since the sum of its digits (30) coincides with the sum of the digits of its distinct prime factors.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 81383133.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81383173) 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 23 ways as a sum of consecutive naturals, for example, 19935 + ... + 23667.

It is an arithmetic number, because the mean of its divisors is an integer number (5011028).

Almost surely, 2^81383133 is an apocalyptic number.

It is an amenable number.

81383133 is a deficient number, since it is larger than the sum of its proper divisors (38881539).

81383133 is a wasteful number, since it uses less digits than its factorization.

81383133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3805 (or 3792 counting only the distinct ones).

The product of its digits is 5184, while the sum is 30.

The square root of 81383133 is about 9021.2600561119. The cubic root of 81383133 is about 433.3559877045.

The spelling of 81383133 in words is "eighty-one million, three hundred eighty-three thousand, one hundred thirty-three".