2161427717 has 2 divisors, whose sum is σ = 2161427718. Its totient is φ = 2161427716.

The previous prime is 2161427711. The next prime is 2161427731. The reversal of 2161427717 is 7177241612.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2145635041 + 15792676 = 46321^2 + 3974^2 .

It is a cyclic number.

It is not a de Polignac number, because 2161427717 - 2²⁰ = 2160379141 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2161427711) 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, 1080713858 + 1080713859.

It is an arithmetic number, because the mean of its divisors is an integer number (1080713859).

Almost surely, 2^2161427717 is an apocalyptic number.

It is an amenable number.

2161427717 is a deficient number, since it is larger than the sum of its proper divisors (1).

2161427717 is an equidigital number, since it uses as much as digits as its factorization.

2161427717 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 32928, while the sum is 38.

The square root of 2161427717 is about 46491.1574065435. The cubic root of 2161427717 is about 1292.9455589796.

The spelling of 2161427717 in words is "two billion, one hundred sixty-one million, four hundred twenty-seven thousand, seven hundred seventeen".