213130681 has 2 divisors, whose sum is σ = 213130682. Its totient is φ = 213130680.

The previous prime is 213130679. The next prime is 213130699. The reversal of 213130681 is 186031312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 211440681 + 1690000 = 14541^2 + 1300^2 .

It is a cyclic number.

It is not a de Polignac number, because 213130681 - 2¹ = 213130679 is a prime.

It is a super-2 number, since 2×213130681² = 90849374367047522, which contains 22 as substring.

Together with 213130679, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (213130601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106565340 + 106565341.

It is an arithmetic number, because the mean of its divisors is an integer number (106565341).

Almost surely, 2^213130681 is an apocalyptic number.

It is an amenable number.

213130681 is a deficient number, since it is larger than the sum of its proper divisors (1).

213130681 is an equidigital number, since it uses as much as digits as its factorization.

213130681 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 213130681 is about 14598.9958901289. The cubic root of 213130681 is about 597.3313714480.

Adding to 213130681 its reverse (186031312), we get a palindrome (399161993).

The spelling of 213130681 in words is "two hundred thirteen million, one hundred thirty thousand, six hundred eighty-one".