81526833 has 12 divisors (see below), whose sum is σ = 119180880. Its totient is φ = 53695896.

The previous prime is 81526829. The next prime is 81526847. The reversal of 81526833 is 33862518.

It is not a de Polignac number, because 81526833 - 2² = 81526829 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81526433) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 53823 + ... + 55316.

It is an arithmetic number, because the mean of its divisors is an integer number (9931740).

Almost surely, 2^81526833 is an apocalyptic number.

81526833 is a gapful number since it is divisible by the number (83) formed by its first and last digit.

It is an amenable number.

81526833 is a deficient number, since it is larger than the sum of its proper divisors (37654047).

81526833 is a wasteful number, since it uses less digits than its factorization.

81526833 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109228 (or 109225 counting only the distinct ones).

The product of its digits is 34560, while the sum is 36.

The square root of 81526833 is about 9029.2210627495. The cubic root of 81526833 is about 433.6108998164.

The spelling of 81526833 in words is "eighty-one million, five hundred twenty-six thousand, eight hundred thirty-three".