1671161191 has 4 divisors (see below), whose sum is σ = 1909898512. Its totient is φ = 1432423872.

The previous prime is 1671161161. The next prime is 1671161197. The reversal of 1671161191 is 1911611761.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1671161191 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 (1671161197) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 119368650 + ... + 119368663.

It is an arithmetic number, because the mean of its divisors is an integer number (477474628).

Almost surely, 2^1671161191 is an apocalyptic number.

1671161191 is a deficient number, since it is larger than the sum of its proper divisors (238737321).

1671161191 is an equidigital number, since it uses as much as digits as its factorization.

1671161191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 238737320.

The product of its digits is 2268, while the sum is 34.

The square root of 1671161191 is about 40879.8384414616. The cubic root of 1671161191 is about 1186.6959144712.

The spelling of 1671161191 in words is "one billion, six hundred seventy-one million, one hundred sixty-one thousand, one hundred ninety-one".