9090910091909 has 4 divisors (see below), whose sum is σ = 9184630814604. Its totient is φ = 8997189369216.

The previous prime is 9090910091863. The next prime is 9090910091969. The reversal of 9090910091909 is 9091900190909.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1613146389409 + 7477763702500 = 1270097^2 + 2734550^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9090910091909 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9090910091969) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 46860361202 + ... + 46860361395.

It is an arithmetic number, because the mean of its divisors is an integer number (2296157703651).

Almost surely, 2^{9090910091909} is an apocalyptic number.

It is an amenable number.

9090910091909 is a deficient number, since it is larger than the sum of its proper divisors (93720722695).

9090910091909 is an equidigital number, since it uses as much as digits as its factorization.

9090910091909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93720722694.

The product of its (nonzero) digits is 531441, while the sum is 56.

The spelling of 9090910091909 in words is "nine trillion, ninety billion, nine hundred ten million, ninety-one thousand, nine hundred nine".