2158466191 has 4 divisors (see below), whose sum is σ = 2466818512. Its totient is φ = 1850113872.

The previous prime is 2158466113. The next prime is 2158466239. The reversal of 2158466191 is 1916648512.

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 2158466191 - 2¹³ = 2158457999 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 (2158467191) 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, 154176150 + ... + 154176163.

It is an arithmetic number, because the mean of its divisors is an integer number (616704628).

Almost surely, 2^2158466191 is an apocalyptic number.

2158466191 is a deficient number, since it is larger than the sum of its proper divisors (308352321).

2158466191 is an equidigital number, since it uses as much as digits as its factorization.

2158466191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 308352320.

The product of its digits is 103680, while the sum is 43.

The square root of 2158466191 is about 46459.2960665570. The cubic root of 2158466191 is about 1292.3547701492.

The spelling of 2158466191 in words is "two billion, one hundred fifty-eight million, four hundred sixty-six thousand, one hundred ninety-one".