81330833 has 8 divisors (see below), whose sum is σ = 82672800. Its totient is φ = 79995168.

The previous prime is 81330827. The next prime is 81330857. The reversal of 81330833 is 33803318.

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 81330833 - 2⁴ = 81330817 is a prime.

It is a super-2 number, since 2×81330833² = 13229408792947778, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 81330796 and 81330805.

It is not an unprimeable number, because it can be changed into a prime (81330803) 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, 29258 + ... + 31916.

It is an arithmetic number, because the mean of its divisors is an integer number (10334100).

Almost surely, 2^81330833 is an apocalyptic number.

It is an amenable number.

81330833 is a deficient number, since it is larger than the sum of its proper divisors (1341967).

81330833 is a wasteful number, since it uses less digits than its factorization.

81330833 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3151.

The product of its (nonzero) digits is 5184, while the sum is 29.

The square root of 81330833 is about 9018.3608821116. The cubic root of 81330833 is about 433.2631372817.

The spelling of 81330833 in words is "eighty-one million, three hundred thirty thousand, eight hundred thirty-three".