81339803 has 2 divisors, whose sum is σ = 81339804. Its totient is φ = 81339802.

The previous prime is 81339793. The next prime is 81339823. The reversal of 81339803 is 30893318.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81339803 - 2⁴ = 81339787 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (81339823) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40669901 + 40669902.

It is an arithmetic number, because the mean of its divisors is an integer number (40669902).

Almost surely, 2^81339803 is an apocalyptic number.

81339803 is a deficient number, since it is larger than the sum of its proper divisors (1).

81339803 is an equidigital number, since it uses as much as digits as its factorization.

81339803 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15552, while the sum is 35.

The square root of 81339803 is about 9018.8581871543. The cubic root of 81339803 is about 433.2790649331.

The spelling of 81339803 in words is "eighty-one million, three hundred thirty-nine thousand, eight hundred three".