2166494831 has 2 divisors, whose sum is σ = 2166494832. Its totient is φ = 2166494830.

The previous prime is 2166494797. The next prime is 2166494921. The reversal of 2166494831 is 1384946612.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2166494831 - 2⁶ = 2166494767 is a prime.

It is a super-3 number, since 3×2166494831³ (a number of 29 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2166494431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1083247415 + 1083247416.

It is an arithmetic number, because the mean of its divisors is an integer number (1083247416).

Almost surely, 2^2166494831 is an apocalyptic number.

2166494831 is a deficient number, since it is larger than the sum of its proper divisors (1).

2166494831 is an equidigital number, since it uses as much as digits as its factorization.

2166494831 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 248832, while the sum is 44.

The square root of 2166494831 is about 46545.6209648126. The cubic root of 2166494831 is about 1293.9551369709.

The spelling of 2166494831 in words is "two billion, one hundred sixty-six million, four hundred ninety-four thousand, eight hundred thirty-one".