2317821997 has 2 divisors, whose sum is σ = 2317821998. Its totient is φ = 2317821996.

The previous prime is 2317821971. The next prime is 2317822049. The reversal of 2317821997 is 7991287132.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1871514121 + 446307876 = 43261^2 + 21126^2 .

It is a cyclic number.

It is not a de Polignac number, because 2317821997 - 2³¹ = 170338349 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2317821997.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2317821197) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1158910998 + 1158910999.

It is an arithmetic number, because the mean of its divisors is an integer number (1158910999).

Almost surely, 2^2317821997 is an apocalyptic number.

It is an amenable number.

2317821997 is a deficient number, since it is larger than the sum of its proper divisors (1).

2317821997 is an equidigital number, since it uses as much as digits as its factorization.

2317821997 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 381024, while the sum is 49.

The square root of 2317821997 is about 48143.7638433058. The cubic root of 2317821997 is about 1323.4067945960.

The spelling of 2317821997 in words is "two billion, three hundred seventeen million, eight hundred twenty-one thousand, nine hundred ninety-seven".