133220161 has 2 divisors, whose sum is σ = 133220162. Its totient is φ = 133220160.

The previous prime is 133220159. The next prime is 133220173. The reversal of 133220161 is 161022331.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 103408561 + 29811600 = 10169^2 + 5460^2 .

It is a cyclic number.

It is not a de Polignac number, because 133220161 - 2¹ = 133220159 is a prime.

It is a super-2 number, since 2×133220161² = 35495222593731842, which contains 22 as substring.

Together with 133220159, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (133220261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66610080 + 66610081.

It is an arithmetic number, because the mean of its divisors is an integer number (66610081).

Almost surely, 2^133220161 is an apocalyptic number.

It is an amenable number.

133220161 is a deficient number, since it is larger than the sum of its proper divisors (1).

133220161 is an equidigital number, since it uses as much as digits as its factorization.

133220161 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 216, while the sum is 19.

The square root of 133220161 is about 11542.1038376892. The cubic root of 133220161 is about 510.7283723036.

Adding to 133220161 its reverse (161022331), we get a palindrome (294242492).

The spelling of 133220161 in words is "one hundred thirty-three million, two hundred twenty thousand, one hundred sixty-one".