81200333 has 4 divisors (see below), whose sum is σ = 82531548. Its totient is φ = 79869120.

The previous prime is 81200291. The next prime is 81200351. The reversal of 81200333 is 33300218.

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 32228329 + 48972004 = 5677^2 + 6998^2 .

It is a cyclic number.

It is not a de Polignac number, because 81200333 - 2¹⁰ = 81199309 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81200363) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 665516 + ... + 665637.

It is an arithmetic number, because the mean of its divisors is an integer number (20632887).

Almost surely, 2^81200333 is an apocalyptic number.

It is an amenable number.

81200333 is a deficient number, since it is larger than the sum of its proper divisors (1331215).

81200333 is a wasteful number, since it uses less digits than its factorization.

81200333 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1331214.

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 81200333 is about 9011.1227380388. The cubic root of 81200333 is about 433.0312813532.

The spelling of 81200333 in words is "eighty-one million, two hundred thousand, three hundred thirty-three".