81101233 has 4 divisors (see below), whose sum is σ = 81417060. Its totient is φ = 80785408.

The previous prime is 81101231. The next prime is 81101249. The reversal of 81101233 is 33210118.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 56430144 + 24671089 = 7512^2 + 4967^2 .

It is a cyclic number.

It is not a de Polignac number, because 81101233 - 2¹ = 81101231 is a prime.

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 81101233.

It is not an unprimeable number, because it can be changed into a prime (81101231) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 157528 + ... + 158041.

It is an arithmetic number, because the mean of its divisors is an integer number (20354265).

Almost surely, 2^81101233 is an apocalyptic number.

It is an amenable number.

81101233 is a deficient number, since it is larger than the sum of its proper divisors (315827).

81101233 is a wasteful number, since it uses less digits than its factorization.

81101233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 315826.

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 81101233 is about 9005.6222994305. The cubic root of 81101233 is about 432.8550469792.

The spelling of 81101233 in words is "eighty-one million, one hundred one thousand, two hundred thirty-three".