2161850771 has 2 divisors, whose sum is σ = 2161850772. Its totient is φ = 2161850770.

The previous prime is 2161850767. The next prime is 2161850807. The reversal of 2161850771 is 1770581612.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2161850771 - 2² = 2161850767 is a prime.

It is not a weakly prime, because it can be changed into another prime (2161850711) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1080925385 + 1080925386.

It is an arithmetic number, because the mean of its divisors is an integer number (1080925386).

Almost surely, 2^2161850771 is an apocalyptic number.

2161850771 is a deficient number, since it is larger than the sum of its proper divisors (1).

2161850771 is an equidigital number, since it uses as much as digits as its factorization.

2161850771 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 23520, while the sum is 38.

The square root of 2161850771 is about 46495.7070168849. The cubic root of 2161850771 is about 1293.0299091066.

The spelling of 2161850771 in words is "two billion, one hundred sixty-one million, eight hundred fifty thousand, seven hundred seventy-one".