81123833 has 8 divisors (see below), whose sum is σ = 94685952. Its totient is φ = 68054976.

The previous prime is 81123827. The next prime is 81123851. The reversal of 81123833 is 33832118.

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 81123833 - 2⁶ = 81123769 is a prime.

It is a super-2 number, since 2×81123833² = 13162152561223778, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 81123796 and 81123805.

It is not an unprimeable number, because it can be changed into a prime (81123853) 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 7 ways as a sum of consecutive naturals, for example, 122960 + ... + 123617.

It is an arithmetic number, because the mean of its divisors is an integer number (11835744).

Almost surely, 2^81123833 is an apocalyptic number.

It is an amenable number.

81123833 is a deficient number, since it is larger than the sum of its proper divisors (13562119).

81123833 is a wasteful number, since it uses less digits than its factorization.

81123833 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 246631.

The product of its digits is 3456, while the sum is 29.

The square root of 81123833 is about 9006.8769837275. The cubic root of 81123833 is about 432.8952502953.

The spelling of 81123833 in words is "eighty-one million, one hundred twenty-three thousand, eight hundred thirty-three".