81058643 has 2 divisors, whose sum is σ = 81058644. Its totient is φ = 81058642.

The previous prime is 81058633. The next prime is 81058667. The reversal of 81058643 is 34685018.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81058643 - 2⁸ = 81058387 is a prime.

It is not a weakly prime, because it can be changed into another prime (81058633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40529321 + 40529322.

It is an arithmetic number, because the mean of its divisors is an integer number (40529322).

Almost surely, 2^81058643 is an apocalyptic number.

81058643 is a deficient number, since it is larger than the sum of its proper divisors (1).

81058643 is an equidigital number, since it uses as much as digits as its factorization.

81058643 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 23040, while the sum is 35.

The square root of 81058643 is about 9003.2573549799. The cubic root of 81058643 is about 432.7792629918.

The spelling of 81058643 in words is "eighty-one million, fifty-eight thousand, six hundred forty-three".