81342233 has 8 divisors (see below), whose sum is σ = 95961600. Its totient is φ = 67472640.

The previous prime is 81342181. The next prime is 81342253. The reversal of 81342233 is 33224318.

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 81342233 - 2²⁰ = 80293657 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81342253) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 187208 + ... + 187641.

It is an arithmetic number, because the mean of its divisors is an integer number (11995200).

Almost surely, 2^81342233 is an apocalyptic number.

It is an amenable number.

81342233 is a deficient number, since it is larger than the sum of its proper divisors (14619367).

81342233 is a wasteful number, since it uses less digits than its factorization.

81342233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 374887.

The product of its digits is 3456, while the sum is 26.

The square root of 81342233 is about 9018.9929038668. The cubic root of 81342233 is about 433.2833795803.

The spelling of 81342233 in words is "eighty-one million, three hundred forty-two thousand, two hundred thirty-three".