2161794637 has 2 divisors, whose sum is σ = 2161794638. Its totient is φ = 2161794636.

The previous prime is 2161794601. The next prime is 2161794653. The reversal of 2161794637 is 7364971612.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1813822921 + 347971716 = 42589^2 + 18654^2 .

It is a cyclic number.

It is not a de Polignac number, because 2161794637 - 2²³ = 2153406029 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2161794667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1080897318 + 1080897319.

It is an arithmetic number, because the mean of its divisors is an integer number (1080897319).

Almost surely, 2^2161794637 is an apocalyptic number.

It is an amenable number.

2161794637 is a deficient number, since it is larger than the sum of its proper divisors (1).

2161794637 is an equidigital number, since it uses as much as digits as its factorization.

2161794637 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 381024, while the sum is 46.

The square root of 2161794637 is about 46495.1033658384. The cubic root of 2161794637 is about 1293.0187175279.

The spelling of 2161794637 in words is "two billion, one hundred sixty-one million, seven hundred ninety-four thousand, six hundred thirty-seven".