2168457191 has 4 divisors (see below), whose sum is σ = 2218886472. Its totient is φ = 2118027912.

The previous prime is 2168457169. The next prime is 2168457199. The reversal of 2168457191 is 1917548612.

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 2168457191 - 2⁶ = 2168457127 is a prime.

It is a super-2 number, since 2×2168457191² = 9404413178399220962, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2168457199) 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, 25214576 + ... + 25214661.

It is an arithmetic number, because the mean of its divisors is an integer number (554721618).

Almost surely, 2^2168457191 is an apocalyptic number.

2168457191 is a deficient number, since it is larger than the sum of its proper divisors (50429281).

2168457191 is an equidigital number, since it uses as much as digits as its factorization.

2168457191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50429280.

The product of its digits is 120960, while the sum is 44.

The square root of 2168457191 is about 46566.6961572324. The cubic root of 2168457191 is about 1294.3456971053.

The spelling of 2168457191 in words is "two billion, one hundred sixty-eight million, four hundred fifty-seven thousand, one hundred ninety-one".