133164565 has 4 divisors (see below), whose sum is σ = 159797484. Its totient is φ = 106531648.

The previous prime is 133164541. The next prime is 133164569. The reversal of 133164565 is 565461331.

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 61355889 + 71808676 = 7833^2 + 8474^2 .

It is a cyclic number.

It is not a de Polignac number, because 133164565 - 2²¹ = 131067413 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 133164565.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133164569) 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, 13316452 + ... + 13316461.

It is an arithmetic number, because the mean of its divisors is an integer number (39949371).

Almost surely, 2^133164565 is an apocalyptic number.

It is an amenable number.

133164565 is a deficient number, since it is larger than the sum of its proper divisors (26632919).

133164565 is an equidigital number, since it uses as much as digits as its factorization.

133164565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26632918.

The product of its digits is 32400, while the sum is 34.

The square root of 133164565 is about 11539.6951866156. The cubic root of 133164565 is about 510.6573159780.

The spelling of 133164565 in words is "one hundred thirty-three million, one hundred sixty-four thousand, five hundred sixty-five".