99643091 has 2 divisors, whose sum is σ = 99643092. Its totient is φ = 99643090.

The previous prime is 99643013. The next prime is 99643097. The reversal of 99643091 is 19034699.

It is a strong prime.

It is an emirp because it is prime and its reverse (19034699) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 99643091 - 2¹⁴ = 99626707 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (99643097) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49821545 + 49821546.

It is an arithmetic number, because the mean of its divisors is an integer number (49821546).

Almost surely, 2^99643091 is an apocalyptic number.

99643091 is a deficient number, since it is larger than the sum of its proper divisors (1).

99643091 is an equidigital number, since it uses as much as digits as its factorization.

99643091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 52488, while the sum is 41.

The square root of 99643091 is about 9982.1385985169. The cubic root of 99643091 is about 463.6060168188.

The spelling of 99643091 in words is "ninety-nine million, six hundred forty-three thousand, ninety-one".