133612609 has 4 divisors (see below), whose sum is σ = 143890516. Its totient is φ = 123334704.

The previous prime is 133612561. The next prime is 133612613. The reversal of 133612609 is 906216331.

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 72335025 + 61277584 = 8505^2 + 7828^2 .

It is a cyclic number.

It is not a de Polignac number, because 133612609 - 2⁹ = 133612097 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (133612649) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5138934 + ... + 5138959.

It is an arithmetic number, because the mean of its divisors is an integer number (35972629).

Almost surely, 2^133612609 is an apocalyptic number.

It is an amenable number.

133612609 is a deficient number, since it is larger than the sum of its proper divisors (10277907).

133612609 is a wasteful number, since it uses less digits than its factorization.

133612609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10277906.

The product of its (nonzero) digits is 5832, while the sum is 31.

The square root of 133612609 is about 11559.0920491187. The cubic root of 133612609 is about 511.2293921468.

The spelling of 133612609 in words is "one hundred thirty-three million, six hundred twelve thousand, six hundred nine".