2217940997 has 2 divisors, whose sum is σ = 2217940998. Its totient is φ = 2217940996.

The previous prime is 2217940981. The next prime is 2217941009. The reversal of 2217940997 is 7990497122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1842899041 + 375041956 = 42929^2 + 19366^2 .

It is a cyclic number.

It is not a de Polignac number, because 2217940997 - 2⁴ = 2217940981 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2217940937) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1108970498 + 1108970499.

It is an arithmetic number, because the mean of its divisors is an integer number (1108970499).

Almost surely, 2^2217940997 is an apocalyptic number.

It is an amenable number.

2217940997 is a deficient number, since it is larger than the sum of its proper divisors (1).

2217940997 is an equidigital number, since it uses as much as digits as its factorization.

2217940997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 571536, while the sum is 50.

The square root of 2217940997 is about 47095.0209364005. The cubic root of 2217940997 is about 1304.1173201447.

The spelling of 2217940997 in words is "two billion, two hundred seventeen million, nine hundred forty thousand, nine hundred ninety-seven".