213130817 has 2 divisors, whose sum is σ = 213130818. Its totient is φ = 213130816.

The previous prime is 213130783. The next prime is 213130849. The reversal of 213130817 is 718031312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 213130801 + 16 = 14599^2 + 4^2 .

It is a cyclic number.

It is not a de Polignac number, because 213130817 - 2¹⁰ = 213129793 is a prime.

It is not a weakly prime, because it can be changed into another prime (213130867) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106565408 + 106565409.

It is an arithmetic number, because the mean of its divisors is an integer number (106565409).

Almost surely, 2^213130817 is an apocalyptic number.

It is an amenable number.

213130817 is a deficient number, since it is larger than the sum of its proper divisors (1).

213130817 is an equidigital number, since it uses as much as digits as its factorization.

213130817 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1008, while the sum is 26.

The square root of 213130817 is about 14599.0005479827. Note that the first 3 decimals coincide. The cubic root of 213130817 is about 597.3314985016.

The spelling of 213130817 in words is "two hundred thirteen million, one hundred thirty thousand, eight hundred seventeen".