99664091 has 2 divisors, whose sum is σ = 99664092. Its totient is φ = 99664090.

The previous prime is 99664087. The next prime is 99664171. The reversal of 99664091 is 19046699.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 99664091 - 2² = 99664087 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (99664001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49832045 + 49832046.

It is an arithmetic number, because the mean of its divisors is an integer number (49832046).

Almost surely, 2^99664091 is an apocalyptic number.

99664091 is a deficient number, since it is larger than the sum of its proper divisors (1).

99664091 is an equidigital number, since it uses as much as digits as its factorization.

99664091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 104976, while the sum is 44.

The square root of 99664091 is about 9983.1904219042. The cubic root of 99664091 is about 463.6385831928.

The spelling of 99664091 in words is "ninety-nine million, six hundred sixty-four thousand, ninety-one".