2193786691 has 4 divisors (see below), whose sum is σ = 2194782912. Its totient is φ = 2192790472.

The previous prime is 2193786659. The next prime is 2193786701. The reversal of 2193786691 is 1966873912.

It is a happy number.

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 2193786691 - 2⁵ = 2193786659 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2193781691) 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, 494800 + ... + 499213.

It is an arithmetic number, because the mean of its divisors is an integer number (548695728).

Almost surely, 2^2193786691 is an apocalyptic number.

2193786691 is a deficient number, since it is larger than the sum of its proper divisors (996221).

2193786691 is an equidigital number, since it uses as much as digits as its factorization.

2193786691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 996220.

The product of its digits is 979776, while the sum is 52.

The square root of 2193786691 is about 46837.8766704897. The cubic root of 2193786691 is about 1299.3659020004.

The spelling of 2193786691 in words is "two billion, one hundred ninety-three million, seven hundred eighty-six thousand, six hundred ninety-one".