2143291691 has 4 divisors (see below), whose sum is σ = 2143473192. Its totient is φ = 2143110192.

The previous prime is 2143291673. The next prime is 2143291693. The reversal of 2143291691 is 1961923412.

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 2143291691 - 2⁶ = 2143291627 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2143291693) 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, 71705 + ... + 97098.

It is an arithmetic number, because the mean of its divisors is an integer number (535868298).

Almost surely, 2^2143291691 is an apocalyptic number.

2143291691 is a deficient number, since it is larger than the sum of its proper divisors (181501).

2143291691 is a wasteful number, since it uses less digits than its factorization.

2143291691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 181500.

The product of its digits is 23328, while the sum is 38.

The square root of 2143291691 is about 46295.6984070875. The cubic root of 2143291691 is about 1289.3191309117.

The spelling of 2143291691 in words is "two billion, one hundred forty-three million, two hundred ninety-one thousand, six hundred ninety-one".