2161798307 has 2 divisors, whose sum is σ = 2161798308. Its totient is φ = 2161798306.

The previous prime is 2161798279. The next prime is 2161798333. The reversal of 2161798307 is 7038971612.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2161798307 is a prime.

It is not a weakly prime, because it can be changed into another prime (2161798607) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1080899153 + 1080899154.

It is an arithmetic number, because the mean of its divisors is an integer number (1080899154).

Almost surely, 2^2161798307 is an apocalyptic number.

2161798307 is a deficient number, since it is larger than the sum of its proper divisors (1).

2161798307 is an equidigital number, since it uses as much as digits as its factorization.

2161798307 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 127008, while the sum is 44.

The square root of 2161798307 is about 46495.1428323433. The cubic root of 2161798307 is about 1293.0194492311.

The spelling of 2161798307 in words is "two billion, one hundred sixty-one million, seven hundred ninety-eight thousand, three hundred seven".