10181919091 has 4 divisors (see below), whose sum is σ = 10195697800. Its totient is φ = 10168140384.

The previous prime is 10181919079. The next prime is 10181919221. The reversal of 10181919091 is 19091918101.

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

It is a cyclic number.

It is not a de Polignac number, because 10181919091 - 2¹⁹ = 10181394803 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (10181919491) 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, 6888246 + ... + 6889723.

It is an arithmetic number, because the mean of its divisors is an integer number (2548924450).

Almost surely, 2^10181919091 is an apocalyptic number.

10181919091 is a deficient number, since it is larger than the sum of its proper divisors (13778709).

10181919091 is an equidigital number, since it uses as much as digits as its factorization.

10181919091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13778708.

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

The spelling of 10181919091 in words is "ten billion, one hundred eighty-one million, nine hundred nineteen thousand, ninety-one".