2217346991 has 2 divisors, whose sum is σ = 2217346992. Its totient is φ = 2217346990.

The previous prime is 2217346961. The next prime is 2217347017. The reversal of 2217346991 is 1996437122.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2217346991 - 2¹⁴ = 2217330607 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2217346921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1108673495 + 1108673496.

It is an arithmetic number, because the mean of its divisors is an integer number (1108673496).

Almost surely, 2^2217346991 is an apocalyptic number.

2217346991 is a deficient number, since it is larger than the sum of its proper divisors (1).

2217346991 is an equidigital number, since it uses as much as digits as its factorization.

2217346991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 163296, while the sum is 44.

The square root of 2217346991 is about 47088.7140512459. The cubic root of 2217346991 is about 1304.0008874293. Note that the first 3 decimals are identical.

The spelling of 2217346991 in words is "two billion, two hundred seventeen million, three hundred forty-six thousand, nine hundred ninety-one".