81439483 has 2 divisors, whose sum is σ = 81439484. Its totient is φ = 81439482.

The previous prime is 81439471. The next prime is 81439493. The reversal of 81439483 is 38493418.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81439483 - 2¹³ = 81431291 is a prime.

It is not a weakly prime, because it can be changed into another prime (81439403) 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 as a sum of consecutive naturals, namely, 40719741 + 40719742.

It is an arithmetic number, because the mean of its divisors is an integer number (40719742).

Almost surely, 2^81439483 is an apocalyptic number.

81439483 is a deficient number, since it is larger than the sum of its proper divisors (1).

81439483 is an equidigital number, since it uses as much as digits as its factorization.

81439483 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 82944, while the sum is 40.

The square root of 81439483 is about 9024.3826935697. The cubic root of 81439483 is about 433.4559837565.

The spelling of 81439483 in words is "eighty-one million, four hundred thirty-nine thousand, four hundred eighty-three".