2191323669 has 8 divisors (see below), whose sum is σ = 2926108992. Its totient is φ = 1458710400.

The previous prime is 2191323611. The next prime is 2191323697. The reversal of 2191323669 is 9663231912.

It is a happy number.

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

It is not a de Polignac number, because 2191323669 - 2⁹ = 2191323157 is a prime.

It is a super-2 number, since 2×2191323669² = 9603798844639243122, which contains 22 as substring.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 2191323669.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2191323469) 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, 540657 + ... + 544694.

It is an arithmetic number, because the mean of its divisors is an integer number (365763624).

Almost surely, 2^2191323669 is an apocalyptic number.

It is an amenable number.

2191323669 is a deficient number, since it is larger than the sum of its proper divisors (734785323).

2191323669 is a wasteful number, since it uses less digits than its factorization.

2191323669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1086027.

The product of its digits is 104976, while the sum is 42.

The square root of 2191323669 is about 46811.5762285356. The cubic root of 2191323669 is about 1298.8794424803.

The spelling of 2191323669 in words is "two billion, one hundred ninety-one million, three hundred twenty-three thousand, six hundred sixty-nine".