9181919091013 has 4 divisors (see below), whose sum is σ = 9665177990560. Its totient is φ = 8698660191468.

The previous prime is 9181919091001. The next prime is 9181919091157. The reversal of 9181919091013 is 3101909191819.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9181919091013 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 (9181919092013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 241629449745 + ... + 241629449782.

It is an arithmetic number, because the mean of its divisors is an integer number (2416294497640).

Almost surely, 2^{9181919091013} is an apocalyptic number.

It is an amenable number.

9181919091013 is a deficient number, since it is larger than the sum of its proper divisors (483258899547).

9181919091013 is a wasteful number, since it uses less digits than its factorization.

9181919091013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 483258899546.

The product of its (nonzero) digits is 157464, while the sum is 52.

The spelling of 9181919091013 in words is "nine trillion, one hundred eighty-one billion, nine hundred nineteen million, ninety-one thousand, thirteen".