2161168489 has 2 divisors, whose sum is σ = 2161168490. Its totient is φ = 2161168488.

The previous prime is 2161168463. The next prime is 2161168511. The reversal of 2161168489 is 9848611612.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1943310889 + 217857600 = 44083^2 + 14760^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2161168489 is a prime.

It is not a weakly prime, because it can be changed into another prime (2161163489) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1080584244 + 1080584245.

It is an arithmetic number, because the mean of its divisors is an integer number (1080584245).

Almost surely, 2^2161168489 is an apocalyptic number.

It is an amenable number.

2161168489 is a deficient number, since it is larger than the sum of its proper divisors (1).

2161168489 is an equidigital number, since it uses as much as digits as its factorization.

2161168489 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 165888, while the sum is 46.

The square root of 2161168489 is about 46488.3693949358. The cubic root of 2161168489 is about 1292.8938676694.

It can be divided in two parts, 21611 and 68489, that added together give a triangular number (90100 = T₄₂₄).

The spelling of 2161168489 in words is "two billion, one hundred sixty-one million, one hundred sixty-eight thousand, four hundred eighty-nine".