2161801573 has 2 divisors, whose sum is σ = 2161801574. Its totient is φ = 2161801572.

The previous prime is 2161801541. The next prime is 2161801591. The reversal of 2161801573 is 3751081612.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1994694244 + 167107329 = 44662^2 + 12927^2 .

It is a cyclic number.

It is not a de Polignac number, because 2161801573 - 2⁵ = 2161801541 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2161801373) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1080900786 + 1080900787.

It is an arithmetic number, because the mean of its divisors is an integer number (1080900787).

Almost surely, 2^2161801573 is an apocalyptic number.

It is an amenable number.

2161801573 is a deficient number, since it is larger than the sum of its proper divisors (1).

2161801573 is an equidigital number, since it uses as much as digits as its factorization.

2161801573 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10080, while the sum is 34.

The square root of 2161801573 is about 46495.1779542782. The cubic root of 2161801573 is about 1293.0201003864.

The spelling of 2161801573 in words is "two billion, one hundred sixty-one million, eight hundred one thousand, five hundred seventy-three".