81833311 has 8 divisors (see below), whose sum is σ = 93601440. Its totient is φ = 70084608.

The previous prime is 81833309. The next prime is 81833317. The reversal of 81833311 is 11333818.

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 81833311 - 2¹ = 81833309 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 81833311.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81833317) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5715 + ... + 14011.

It is an arithmetic number, because the mean of its divisors is an integer number (11700180).

Almost surely, 2^81833311 is an apocalyptic number.

81833311 is a deficient number, since it is larger than the sum of its proper divisors (11768129).

81833311 is a wasteful number, since it uses less digits than its factorization.

81833311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9713.

The product of its digits is 1728, while the sum is 28.

The square root of 81833311 is about 9046.1765956674. The cubic root of 81833311 is about 434.1535678736.

The spelling of 81833311 in words is "eighty-one million, eight hundred thirty-three thousand, three hundred eleven".