2117748389 has 2 divisors, whose sum is σ = 2117748390. Its totient is φ = 2117748388.

The previous prime is 2117748349. The next prime is 2117748397. The reversal of 2117748389 is 9838477112.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1977136225 + 140612164 = 44465^2 + 11858^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2117748389 is a prime.

It is a super-2 number, since 2×2117748389² = 8969716478224190642, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2117748319) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1058874194 + 1058874195.

It is an arithmetic number, because the mean of its divisors is an integer number (1058874195).

Almost surely, 2^2117748389 is an apocalyptic number.

It is an amenable number.

2117748389 is a deficient number, since it is larger than the sum of its proper divisors (1).

2117748389 is an equidigital number, since it uses as much as digits as its factorization.

2117748389 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 677376, while the sum is 50.

The square root of 2117748389 is about 46019.0003042222. Note that the first 3 decimals coincide. The cubic root of 2117748389 is about 1284.1767024616.

The spelling of 2117748389 in words is "two billion, one hundred seventeen million, seven hundred forty-eight thousand, three hundred eighty-nine".