81526233 has 8 divisors (see below), whose sum is σ = 108887328. Its totient is φ = 54257984.

The previous prime is 81526213. The next prime is 81526241. The reversal of 81526233 is 33262518.

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 81526233 - 2¹⁰ = 81525209 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 81526233.

It is not an unprimeable number, because it can be changed into a prime (81526213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21135 + ... + 24692.

It is an arithmetic number, because the mean of its divisors is an integer number (13610916).

Almost surely, 2^81526233 is an apocalyptic number.

It is an amenable number.

81526233 is a deficient number, since it is larger than the sum of its proper divisors (27361095).

81526233 is a wasteful number, since it uses less digits than its factorization.

81526233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46423.

The product of its digits is 8640, while the sum is 30.

The square root of 81526233 is about 9029.1878372310. The cubic root of 81526233 is about 433.6098360882.

The spelling of 81526233 in words is "eighty-one million, five hundred twenty-six thousand, two hundred thirty-three".