2117813 has 2 divisors, whose sum is σ = 2117814. Its totient is φ = 2117812.

The previous prime is 2117777. The next prime is 2117821. The reversal of 2117813 is 3187112.

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., 1737124 + 380689 = 1318^2 + 617^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2117813 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2117833) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1058906 + 1058907.

It is an arithmetic number, because the mean of its divisors is an integer number (1058907).

2^2117813 is an apocalyptic number.

It is an amenable number.

2117813 is a deficient number, since it is larger than the sum of its proper divisors (1).

2117813 is an equidigital number, since it uses as much as digits as its factorization.

2117813 is an evil number, because the sum of its binary digits is even.

The product of its digits is 336, while the sum is 23.

The square root of 2117813 is about 1455.2707651843. The cubic root of 2117813 is about 128.4189762102.

The spelling of 2117813 in words is "two million, one hundred seventeen thousand, eight hundred thirteen".