2117387813 has 2 divisors, whose sum is σ = 2117387814. Its totient is φ = 2117387812.

The previous prime is 2117387803. The next prime is 2117387819. The reversal of 2117387813 is 3187837112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2114436289 + 2951524 = 45983^2 + 1718^2 .

It is a cyclic number.

It is not a de Polignac number, because 2117387813 - 2⁶ = 2117387749 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2117387819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1058693906 + 1058693907.

It is an arithmetic number, because the mean of its divisors is an integer number (1058693907).

Almost surely, 2^2117387813 is an apocalyptic number.

It is an amenable number.

2117387813 is a deficient number, since it is larger than the sum of its proper divisors (1).

2117387813 is an equidigital number, since it uses as much as digits as its factorization.

2117387813 is an evil number, because the sum of its binary digits is even.

The product of its digits is 56448, while the sum is 41.

The square root of 2117387813 is about 46015.0824513007. The cubic root of 2117387813 is about 1284.1038153671.

The spelling of 2117387813 in words is "two billion, one hundred seventeen million, three hundred eighty-seven thousand, eight hundred thirteen".