2991409217 has 2 divisors, whose sum is σ = 2991409218. Its totient is φ = 2991409216.

The previous prime is 2991409163. The next prime is 2991409237. The reversal of 2991409217 is 7129041992.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2212385296 + 779023921 = 47036^2 + 27911^2 .

It is a cyclic number.

It is not a de Polignac number, because 2991409217 - 2¹⁸ = 2991147073 is a prime.

It is not a weakly prime, because it can be changed into another prime (2991409237) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1495704608 + 1495704609.

It is an arithmetic number, because the mean of its divisors is an integer number (1495704609).

Almost surely, 2^2991409217 is an apocalyptic number.

It is an amenable number.

2991409217 is a deficient number, since it is larger than the sum of its proper divisors (1).

2991409217 is an equidigital number, since it uses as much as digits as its factorization.

2991409217 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 81648, while the sum is 44.

The square root of 2991409217 is about 54693.7767666487. The cubic root of 2991409217 is about 1440.8715815700.

The spelling of 2991409217 in words is "two billion, nine hundred ninety-one million, four hundred nine thousand, two hundred seventeen".