99109091 has 2 divisors, whose sum is σ = 99109092. Its totient is φ = 99109090.

The previous prime is 99109069. The next prime is 99109103. The reversal of 99109091 is 19090199.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 99109091 - 2⁶ = 99109027 is a prime.

It is a super-2 number, since 2×99109091² = 19645223837692562, which contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (99109291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49554545 + 49554546.

It is an arithmetic number, because the mean of its divisors is an integer number (49554546).

Almost surely, 2^99109091 is an apocalyptic number.

99109091 is a deficient number, since it is larger than the sum of its proper divisors (1).

99109091 is an equidigital number, since it uses as much as digits as its factorization.

99109091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6561, while the sum is 38.

The square root of 99109091 is about 9955.3548907108. The cubic root of 99109091 is about 462.7763584280.

The spelling of 99109091 in words is "ninety-nine million, one hundred nine thousand, ninety-one".