2191448773 has 4 divisors (see below), whose sum is σ = 2204893408. Its totient is φ = 2178004140.

The previous prime is 2191448759. The next prime is 2191448789. The reversal of 2191448773 is 3778441912.

2191448773 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2191448773 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2191448473) 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, 6722073 + ... + 6722398.

It is an arithmetic number, because the mean of its divisors is an integer number (551223352).

Almost surely, 2^2191448773 is an apocalyptic number.

It is an amenable number.

2191448773 is a deficient number, since it is larger than the sum of its proper divisors (13444635).

2191448773 is a wasteful number, since it uses less digits than its factorization.

2191448773 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13444634.

The product of its digits is 338688, while the sum is 46.

The square root of 2191448773 is about 46812.9124601322. The cubic root of 2191448773 is about 1298.9041599489.

The spelling of 2191448773 in words is "two billion, one hundred ninety-one million, four hundred forty-eight thousand, seven hundred seventy-three".