9181919091012 has 24 divisors (see below), whose sum is σ = 21436178901312. Its totient is φ = 3058968122400.

The previous prime is 9181919091001. The next prime is 9181919091157. The reversal of 9181919091012 is 2101909191819.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 208923939 + ... + 208967882.

It is an arithmetic number, because the mean of its divisors is an integer number (893174120888).

Almost surely, 2^{9181919091012} is an apocalyptic number.

It is an amenable number.

9181919091012 is an abundant number, since it is smaller than the sum of its proper divisors (12254259810300).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

9181919091012 is a wasteful number, since it uses less digits than its factorization.

9181919091012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 417893659 (or 417893657 counting only the distinct ones).

The product of its (nonzero) digits is 104976, while the sum is 51.

The spelling of 9181919091012 in words is "nine trillion, one hundred eighty-one billion, nine hundred nineteen million, ninety-one thousand, twelve".