81833293 has 4 divisors (see below), whose sum is σ = 82056640. Its totient is φ = 81609948.

The previous prime is 81833281. The next prime is 81833299. The reversal of 81833293 is 39233818.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81833293 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81833299) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 111123 + ... + 111856.

It is an arithmetic number, because the mean of its divisors is an integer number (20514160).

Almost surely, 2^81833293 is an apocalyptic number.

It is an amenable number.

81833293 is a deficient number, since it is larger than the sum of its proper divisors (223347).

81833293 is a wasteful number, since it uses less digits than its factorization.

81833293 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 223346.

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

The square root of 81833293 is about 9046.1756007719. The cubic root of 81833293 is about 434.1535360415.

It can be divided in two parts, 8183 and 3293, that added together give a triangular number (11476 = T₁₅₁).

The spelling of 81833293 in words is "eighty-one million, eight hundred thirty-three thousand, two hundred ninety-three".