99643 has 2 divisors, whose sum is σ = 99644. Its totient is φ = 99642.

The previous prime is 99623. The next prime is 99661. The reversal of 99643 is 34699.

It is a strong prime.

99643 is a truncatable prime.

It is a cyclic number.

It is not a de Polignac number, because 99643 - 2⁵ = 99611 is a prime.

It is a nialpdrome in base 10.

It is not a weakly prime, because it can be changed into another prime (99623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49821 + 49822.

It is an arithmetic number, because the mean of its divisors is an integer number (49822).

2⁹⁹⁶⁴³ is an apocalyptic number.

99643 is a deficient number, since it is larger than the sum of its proper divisors (1).

99643 is an equidigital number, since it uses as much as digits as its factorization.

99643 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5832, while the sum is 31.

The square root of 99643 is about 315.6627947668. The cubic root of 99643 is about 46.3605875688.

It can be divided in two parts, 9964 and 3, that multiplied together give a palindrome (29892).

The spelling of 99643 in words is "ninety-nine thousand, six hundred forty-three".