213333161 has 2 divisors, whose sum is σ = 213333162. Its totient is φ = 213333160.

The previous prime is 213333151. The next prime is 213333163. The reversal of 213333161 is 161333312.

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., 206209600 + 7123561 = 14360^2 + 2669^2 .

It is a cyclic number.

It is not a de Polignac number, because 213333161 - 2¹⁰ = 213332137 is a prime.

It is a super-2 number, since 2×213333161² = 91022075164503842, which contains 22 as substring.

Together with 213333163, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (213333163) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106666580 + 106666581.

It is an arithmetic number, because the mean of its divisors is an integer number (106666581).

Almost surely, 2^213333161 is an apocalyptic number.

It is an amenable number.

213333161 is a deficient number, since it is larger than the sum of its proper divisors (1).

213333161 is an equidigital number, since it uses as much as digits as its factorization.

213333161 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 972, while the sum is 23.

The square root of 213333161 is about 14605.9289673749. The cubic root of 213333161 is about 597.5204719794.

Adding to 213333161 its reverse (161333312), we get a palindrome (374666473).

The spelling of 213333161 in words is "two hundred thirteen million, three hundred thirty-three thousand, one hundred sixty-one".