81381303 has 12 divisors (see below), whose sum is σ = 118398280. Its totient is φ = 53863056.

The previous prime is 81381281. The next prime is 81381317. The reversal of 81381303 is 30318318.

It is not a de Polignac number, because 81381303 - 2¹³ = 81373111 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 (81381323) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 31276 + ... + 33777.

Almost surely, 2^81381303 is an apocalyptic number.

81381303 is a deficient number, since it is larger than the sum of its proper divisors (37016977).

81381303 is a wasteful number, since it uses less digits than its factorization.

81381303 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65198 (or 65195 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 81381303 is about 9021.1586284690. The cubic root of 81381303 is about 433.3527394991.

The spelling of 81381303 in words is "eighty-one million, three hundred eighty-one thousand, three hundred three".