99880091 has 2 divisors, whose sum is σ = 99880092. Its totient is φ = 99880090.

The previous prime is 99880087. The next prime is 99880111. The reversal of 99880091 is 19008899.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 99880091 - 2² = 99880087 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (99880021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49940045 + 49940046.

It is an arithmetic number, because the mean of its divisors is an integer number (49940046).

Almost surely, 2^99880091 is an apocalyptic number.

99880091 is a deficient number, since it is larger than the sum of its proper divisors (1).

99880091 is an equidigital number, since it uses as much as digits as its factorization.

99880091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 46656, while the sum is 44.

The square root of 99880091 is about 9994.0027516506. The cubic root of 99880091 is about 463.9732864005.

The spelling of 99880091 in words is "ninety-nine million, eight hundred eighty thousand, ninety-one".