2991217 has 2 divisors, whose sum is σ = 2991218. Its totient is φ = 2991216.

The previous prime is 2991203. The next prime is 2991229. The reversal of 2991217 is 7121992.

2991217 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., 2676496 + 314721 = 1636^2 + 561^2 .

It is a cyclic number.

It is not a de Polignac number, because 2991217 - 2¹¹ = 2989169 is a prime.

It is not a weakly prime, because it can be changed into another prime (2991277) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1495608 + 1495609.

It is an arithmetic number, because the mean of its divisors is an integer number (1495609).

2^2991217 is an apocalyptic number.

It is an amenable number.

2991217 is a deficient number, since it is larger than the sum of its proper divisors (1).

2991217 is an equidigital number, since it uses as much as digits as its factorization.

2991217 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2268, while the sum is 31.

The square root of 2991217 is about 1729.5135154141. The cubic root of 2991217 is about 144.0840719199.

It can be divided in two parts, 29912 and 17, that added together give a square (29929 = 173²).

The spelling of 2991217 in words is "two million, nine hundred ninety-one thousand, two hundred seventeen".