1671166291 has 4 divisors (see below), whose sum is σ = 1677113784. Its totient is φ = 1665218800.

The previous prime is 1671166253. The next prime is 1671166313. The reversal of 1671166291 is 1926611761.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1926611761 = 19 ⋅101400619.

It is a cyclic number.

It is not a de Polignac number, because 1671166291 - 2⁷ = 1671166163 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1671166391) 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, 2973325 + ... + 2973886.

It is an arithmetic number, because the mean of its divisors is an integer number (419278446).

Almost surely, 2^1671166291 is an apocalyptic number.

1671166291 is a deficient number, since it is larger than the sum of its proper divisors (5947493).

1671166291 is an equidigital number, since it uses as much as digits as its factorization.

1671166291 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5947492.

The product of its digits is 27216, while the sum is 40.

The square root of 1671166291 is about 40879.9008193513. The cubic root of 1671166291 is about 1186.6971216444.

The spelling of 1671166291 in words is "one billion, six hundred seventy-one million, one hundred sixty-six thousand, two hundred ninety-one".