2191158187 has 2 divisors, whose sum is σ = 2191158188. Its totient is φ = 2191158186.

The previous prime is 2191158113. The next prime is 2191158199. The reversal of 2191158187 is 7818511912.

It is a happy number.

2191158187 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2191158187 - 2⁷ = 2191158059 is a prime.

It is not a weakly prime, because it can be changed into another prime (2191153187) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1095579093 + 1095579094.

It is an arithmetic number, because the mean of its divisors is an integer number (1095579094).

Almost surely, 2^2191158187 is an apocalyptic number.

2191158187 is a deficient number, since it is larger than the sum of its proper divisors (1).

2191158187 is an equidigital number, since it uses as much as digits as its factorization.

2191158187 is an evil number, because the sum of its binary digits is even.

The product of its digits is 40320, while the sum is 43.

The square root of 2191158187 is about 46809.8086622879. The cubic root of 2191158187 is about 1298.8467458684.

The spelling of 2191158187 in words is "two billion, one hundred ninety-one million, one hundred fifty-eight thousand, one hundred eighty-seven".