10091919181 has 4 divisors (see below), whose sum is σ = 10168956864. Its totient is φ = 10014881500.

The previous prime is 10091919169. The next prime is 10091919199. The reversal of 10091919181 is 18191919001.

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, and also an emirpimes, since its reverse is a distinct semiprime: 18191919001 = 83 ⋅219179747.

It is a cyclic number.

It is not a de Polignac number, because 10091919181 - 2¹¹ = 10091917133 is a prime.

It is a super-2 number, since 2×10091919181² (a number of 21 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10091919781) 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, 38518645 + ... + 38518906.

It is an arithmetic number, because the mean of its divisors is an integer number (2542239216).

Almost surely, 2^10091919181 is an apocalyptic number.

It is an amenable number.

10091919181 is a deficient number, since it is larger than the sum of its proper divisors (77037683).

10091919181 is an equidigital number, since it uses as much as digits as its factorization.

10091919181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77037682.

The product of its (nonzero) digits is 5832, while the sum is 40.

The spelling of 10091919181 in words is "ten billion, ninety-one million, nine hundred nineteen thousand, one hundred eighty-one".