1091919191923 has 8 divisors (see below), whose sum is σ = 1247957044992. Its totient is φ = 935893688136.

The previous prime is 1091919191921. The next prime is 1091919191929. The reversal of 1091919191923 is 3291919191901.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1091919191923 - 2¹ = 1091919191921 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1091919191921) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2897065 + ... + 3252202.

It is an arithmetic number, because the mean of its divisors is an integer number (155994630624).

Almost surely, 2^{1091919191923} is an apocalyptic number.

1091919191923 is a deficient number, since it is larger than the sum of its proper divisors (156037853069).

1091919191923 is an equidigital number, since it uses as much as digits as its factorization.

1091919191923 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6174641.

The product of its (nonzero) digits is 354294, while the sum is 55.

The spelling of 1091919191923 in words is "one trillion, ninety-one billion, nine hundred nineteen million, one hundred ninety-one thousand, nine hundred twenty-three".