2217506491 has 2 divisors, whose sum is σ = 2217506492. Its totient is φ = 2217506490.

The previous prime is 2217506461. The next prime is 2217506507. The reversal of 2217506491 is 1946057122.

2217506491 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 is a cyclic number.

It is not a de Polignac number, because 2217506491 - 2¹⁹ = 2216982203 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2217506491.

It is not a weakly prime, because it can be changed into another prime (2217506441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1108753245 + 1108753246.

It is an arithmetic number, because the mean of its divisors is an integer number (1108753246).

Almost surely, 2^2217506491 is an apocalyptic number.

2217506491 is a deficient number, since it is larger than the sum of its proper divisors (1).

2217506491 is an equidigital number, since it uses as much as digits as its factorization.

2217506491 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 30240, while the sum is 37.

The square root of 2217506491 is about 47090.4076325529. The cubic root of 2217506491 is about 1304.0321534957.

The spelling of 2217506491 in words is "two billion, two hundred seventeen million, five hundred six thousand, four hundred ninety-one".