81339203 has 24 divisors (see below), whose sum is σ = 97188336. Its totient is φ = 67238400.

The previous prime is 81339199. The next prime is 81339217. The reversal of 81339203 is 30293318.

It is not a de Polignac number, because 81339203 - 2² = 81339199 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81339803) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 789650 + ... + 789752.

It is an arithmetic number, because the mean of its divisors is an integer number (4049514).

Almost surely, 2^81339203 is an apocalyptic number.

81339203 is a deficient number, since it is larger than the sum of its proper divisors (15849133).

81339203 is a wasteful number, since it uses less digits than its factorization.

81339203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 275 (or 172 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 29.

The square root of 81339203 is about 9018.8249234587. The cubic root of 81339203 is about 433.2779995749.

The spelling of 81339203 in words is "eighty-one million, three hundred thirty-nine thousand, two hundred three".