213342161 has 2 divisors, whose sum is σ = 213342162. Its totient is φ = 213342160.

The previous prime is 213342139. The next prime is 213342187. The reversal of 213342161 is 161243312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 122235136 + 91107025 = 11056^2 + 9545^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-213342161 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (213342191) 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, 106671080 + 106671081.

It is an arithmetic number, because the mean of its divisors is an integer number (106671081).

Almost surely, 2^213342161 is an apocalyptic number.

It is an amenable number.

213342161 is a deficient number, since it is larger than the sum of its proper divisors (1).

213342161 is an equidigital number, since it uses as much as digits as its factorization.

213342161 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 864, while the sum is 23.

The square root of 213342161 is about 14606.2370581885. The cubic root of 213342161 is about 597.5288744996.

Adding to 213342161 its reverse (161243312), we get a palindrome (374585473).

The spelling of 213342161 in words is "two hundred thirteen million, three hundred forty-two thousand, one hundred sixty-one".