9181919091909 has 32 divisors (see below), whose sum is σ = 13013247525120. Its totient is φ = 5747706058752.

The previous prime is 9181919091889. The next prime is 9181919091931. The reversal of 9181919091909 is 9091909191819.

It is not a de Polignac number, because 9181919091909 - 2²⁵ = 9181885537477 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 9181919091909.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9181919091209) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6034677 + ... + 7401429.

It is an arithmetic number, because the mean of its divisors is an integer number (406663985160).

Almost surely, 2^{9181919091909} is an apocalyptic number.

It is an amenable number.

9181919091909 is a deficient number, since it is larger than the sum of its proper divisors (3831328433211).

9181919091909 is a wasteful number, since it uses less digits than its factorization.

9181919091909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1368909.

The product of its (nonzero) digits is 4251528, while the sum is 66.

The spelling of 9181919091909 in words is "nine trillion, one hundred eighty-one billion, nine hundred nineteen million, ninety-one thousand, nine hundred nine".