81002233 has 8 divisors (see below), whose sum is σ = 87739848. Its totient is φ = 74337024.

The previous prime is 81002231. The next prime is 81002237. The reversal of 81002233 is 33220018.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 15116544 + 65885689 = 3888^2 + 8117^2 .

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 81002233 - 2¹ = 81002231 is a prime.

It is a super-2 number, since 2×81002233² = 13122723501972578, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 81002233.

It is not an unprimeable number, because it can be changed into a prime (81002231) 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, 15760 + ... + 20257.

It is an arithmetic number, because the mean of its divisors is an integer number (10967481).

Almost surely, 2^81002233 is an apocalyptic number.

It is an amenable number.

81002233 is a deficient number, since it is larger than the sum of its proper divisors (6737615).

81002233 is a wasteful number, since it uses less digits than its factorization.

81002233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36203.

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 81002233 is about 9000.1240547006. The cubic root of 81002233 is about 432.6788470351.

The spelling of 81002233 in words is "eighty-one million, two thousand, two hundred thirty-three".