2191260817 has 2 divisors, whose sum is σ = 2191260818. Its totient is φ = 2191260816.

The previous prime is 2191260803. The next prime is 2191260821. The reversal of 2191260817 is 7180621912.

2191260817 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1955054656 + 236206161 = 44216^2 + 15369^2 .

It is a cyclic number.

It is not a de Polignac number, because 2191260817 - 2¹⁹ = 2190736529 is a prime.

It is not a weakly prime, because it can be changed into another prime (2191260847) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1095630408 + 1095630409.

It is an arithmetic number, because the mean of its divisors is an integer number (1095630409).

Almost surely, 2^2191260817 is an apocalyptic number.

It is an amenable number.

2191260817 is a deficient number, since it is larger than the sum of its proper divisors (1).

2191260817 is an equidigital number, since it uses as much as digits as its factorization.

2191260817 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12096, while the sum is 37.

The square root of 2191260817 is about 46810.9048940522. The cubic root of 2191260817 is about 1298.8670241184.

The spelling of 2191260817 in words is "two billion, one hundred ninety-one million, two hundred sixty thousand, eight hundred seventeen".