2193569891 has 4 divisors (see below), whose sum is σ = 2322603432. Its totient is φ = 2064536352.

The previous prime is 2193569881. The next prime is 2193569897. The reversal of 2193569891 is 1989653912.

It is a happy number.

2193569891 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.

It is a cyclic number.

It is not a de Polignac number, because 2193569891 - 2³⁰ = 1119828067 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2193569897) 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, 64516745 + ... + 64516778.

It is an arithmetic number, because the mean of its divisors is an integer number (580650858).

Almost surely, 2^2193569891 is an apocalyptic number.

2193569891 is a deficient number, since it is larger than the sum of its proper divisors (129033541).

2193569891 is a wasteful number, since it uses less digits than its factorization.

2193569891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129033540.

The product of its digits is 1049760, while the sum is 53.

The square root of 2193569891 is about 46835.5622470789. The cubic root of 2193569891 is about 1299.3230975033.

The spelling of 2193569891 in words is "two billion, one hundred ninety-three million, five hundred sixty-nine thousand, eight hundred ninety-one".