81389083 has 2 divisors, whose sum is σ = 81389084. Its totient is φ = 81389082.

The previous prime is 81389071. The next prime is 81389123. The reversal of 81389083 is 38098318.

It is an a-pointer prime, because the next prime (81389123) can be obtained adding 81389083 to its sum of digits (40).

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81389083 is a prime.

It is not a weakly prime, because it can be changed into another prime (81389023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40694541 + 40694542.

It is an arithmetic number, because the mean of its divisors is an integer number (40694542).

Almost surely, 2^81389083 is an apocalyptic number.

81389083 is a deficient number, since it is larger than the sum of its proper divisors (1).

81389083 is an equidigital number, since it uses as much as digits as its factorization.

81389083 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 41472, while the sum is 40.

The square root of 81389083 is about 9021.5898266326. The cubic root of 81389083 is about 433.3665484731.

The spelling of 81389083 in words is "eighty-one million, three hundred eighty-nine thousand, eighty-three".