213162161 has 2 divisors, whose sum is σ = 213162162. Its totient is φ = 213162160.

The previous prime is 213162149. The next prime is 213162179. The reversal of 213162161 is 161261312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 211993600 + 1168561 = 14560^2 + 1081^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-213162161 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (213162101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106581080 + 106581081.

It is an arithmetic number, because the mean of its divisors is an integer number (106581081).

Almost surely, 2^213162161 is an apocalyptic number.

It is an amenable number.

213162161 is a deficient number, since it is larger than the sum of its proper divisors (1).

213162161 is an equidigital number, since it uses as much as digits as its factorization.

213162161 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 432, while the sum is 23.

The square root of 213162161 is about 14600.0740066617. The cubic root of 213162161 is about 597.3607791737.

The spelling of 213162161 in words is "two hundred thirteen million, one hundred sixty-two thousand, one hundred sixty-one".