81210833 has 8 divisors (see below), whose sum is σ = 88788960. Its totient is φ = 73665280.

The previous prime is 81210823. The next prime is 81210881. The reversal of 81210833 is 33801218.

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 81210833 - 2¹⁰ = 81209809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81210803) 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, 2768 + ... + 13041.

It is an arithmetic number, because the mean of its divisors is an integer number (11098620).

Almost surely, 2^81210833 is an apocalyptic number.

It is an amenable number.

81210833 is a deficient number, since it is larger than the sum of its proper divisors (7578127).

81210833 is a wasteful number, since it uses less digits than its factorization.

81210833 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16287.

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 81210833 is about 9011.7053325106. The cubic root of 81210833 is about 433.0499456136.

The spelling of 81210833 in words is "eighty-one million, two hundred ten thousand, eight hundred thirty-three".