81200303 has 4 divisors (see below), whose sum is σ = 81381600. Its totient is φ = 81019008.

The previous prime is 81200291. The next prime is 81200351. The reversal of 81200303 is 30300218.

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

It is a cyclic number.

It is not a de Polignac number, because 81200303 - 2⁶ = 81200239 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 polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 89975 + ... + 90872.

It is an arithmetic number, because the mean of its divisors is an integer number (20345400).

Almost surely, 2^81200303 is an apocalyptic number.

81200303 is a deficient number, since it is larger than the sum of its proper divisors (181297).

81200303 is a wasteful number, since it uses less digits than its factorization.

81200303 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 181296.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 81200303 is about 9011.1210734292. The cubic root of 81200303 is about 433.0312280244.

The spelling of 81200303 in words is "eighty-one million, two hundred thousand, three hundred three".