2217493813 has 2 divisors, whose sum is σ = 2217493814. Its totient is φ = 2217493812.

The previous prime is 2217493757. The next prime is 2217493823. The reversal of 2217493813 is 3183947122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1543468369 + 674025444 = 39287^2 + 25962^2 .

It is a cyclic number.

It is not a de Polignac number, because 2217493813 - 2²⁹ = 1680622901 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2217493823) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1108746906 + 1108746907.

It is an arithmetic number, because the mean of its divisors is an integer number (1108746907).

Almost surely, 2^2217493813 is an apocalyptic number.

It is an amenable number.

2217493813 is a deficient number, since it is larger than the sum of its proper divisors (1).

2217493813 is an equidigital number, since it uses as much as digits as its factorization.

2217493813 is an evil number, because the sum of its binary digits is even.

The product of its digits is 72576, while the sum is 40.

The square root of 2217493813 is about 47090.2730189580. The cubic root of 2217493813 is about 1304.0296683393.

The spelling of 2217493813 in words is "two billion, two hundred seventeen million, four hundred ninety-three thousand, eight hundred thirteen".