91108069 has 6 divisors (see below), whose sum is σ = 98655666. Its totient is φ = 84099600.

The previous prime is 91108063. The next prime is 91108091. The reversal of 91108069 is 96080119.

91108069 = T₂₁₄₂ + T₂₁₄₃ + ... + T₂₁₈₀.

It can be written as a sum of positive squares in 3 ways, for example, as 191844 + 90916225 = 438^2 + 9535^2 .

It is not a de Polignac number, because 91108069 - 2⁷ = 91107941 is a prime.

It is a super-2 number, since 2×91108069² = 16601360473817522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91108063) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 269382 + ... + 269719.

It is an arithmetic number, because the mean of its divisors is an integer number (16442611).

Almost surely, 2^91108069 is an apocalyptic number.

It is an amenable number.

91108069 is a deficient number, since it is larger than the sum of its proper divisors (7547597).

91108069 is a wasteful number, since it uses less digits than its factorization.

91108069 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 539127 (or 539114 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 34.

The square root of 91108069 is about 9545.0546881618. The cubic root of 91108069 is about 449.9721283149.

The spelling of 91108069 in words is "ninety-one million, one hundred eight thousand, sixty-nine".