2161864807 has 2 divisors, whose sum is σ = 2161864808. Its totient is φ = 2161864806.

The previous prime is 2161864751. The next prime is 2161864853. The reversal of 2161864807 is 7084681612.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2161864807 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2161864867) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1080932403 + 1080932404.

It is an arithmetic number, because the mean of its divisors is an integer number (1080932404).

Almost surely, 2^2161864807 is an apocalyptic number.

2161864807 is a deficient number, since it is larger than the sum of its proper divisors (1).

2161864807 is an equidigital number, since it uses as much as digits as its factorization.

2161864807 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 129024, while the sum is 43.

The square root of 2161864807 is about 46495.8579553061. The cubic root of 2161864807 is about 1293.0327074695.

The spelling of 2161864807 in words is "two billion, one hundred sixty-one million, eight hundred sixty-four thousand, eight hundred seven".