2146491191 has 4 divisors (see below), whose sum is σ = 2311605912. Its totient is φ = 1981376472.

The previous prime is 2146491187. The next prime is 2146491239. The reversal of 2146491191 is 1911946412.

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 2146491191 - 2² = 2146491187 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 (2146491121) 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, 82557341 + ... + 82557366.

It is an arithmetic number, because the mean of its divisors is an integer number (577901478).

Almost surely, 2^2146491191 is an apocalyptic number.

2146491191 is a deficient number, since it is larger than the sum of its proper divisors (165114721).

2146491191 is a wasteful number, since it uses less digits than its factorization.

2146491191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165114720.

The product of its digits is 15552, while the sum is 38.

The square root of 2146491191 is about 46330.2405670422. The cubic root of 2146491191 is about 1289.9603759638.

The spelling of 2146491191 in words is "two billion, one hundred forty-six million, four hundred ninety-one thousand, one hundred ninety-one".