99623 has 2 divisors, whose sum is σ = 99624. Its totient is φ = 99622.

The previous prime is 99611. The next prime is 99643. The reversal of 99623 is 32699.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 99623 - 2⁴ = 99607 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49811 + 49812.

It is an arithmetic number, because the mean of its divisors is an integer number (49812).

2⁹⁹⁶²³ is an apocalyptic number.

99623 is a deficient number, since it is larger than the sum of its proper divisors (1).

99623 is an equidigital number, since it uses as much as digits as its factorization.

99623 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2916, while the sum is 29.

The square root of 99623 is about 315.6311138022. The cubic root of 99623 is about 46.3574855821.

The spelling of 99623 in words is "ninety-nine thousand, six hundred twenty-three".