133130161 has 4 divisors (see below), whose sum is σ = 134102052. Its totient is φ = 132158272.

The previous prime is 133130147. The next prime is 133130171. The reversal of 133130161 is 161031331.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 36481600 + 96648561 = 6040^2 + 9831^2 .

It is a cyclic number.

It is not a de Polignac number, because 133130161 - 2¹³ = 133121969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (133130171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 485740 + ... + 486013.

It is an arithmetic number, because the mean of its divisors is an integer number (33525513).

Almost surely, 2^133130161 is an apocalyptic number.

It is an amenable number.

133130161 is a deficient number, since it is larger than the sum of its proper divisors (971891).

133130161 is an equidigital number, since it uses as much as digits as its factorization.

133130161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 971890.

The product of its (nonzero) digits is 162, while the sum is 19.

The square root of 133130161 is about 11538.2044096991. The cubic root of 133130161 is about 510.6133348896.

Adding to 133130161 its reverse (161031331), we get a palindrome (294161492).

The spelling of 133130161 in words is "one hundred thirty-three million, one hundred thirty thousand, one hundred sixty-one".