133186709 has 4 divisors (see below), whose sum is σ = 133478604. Its totient is φ = 132894816.

The previous prime is 133186693. The next prime is 133186727. The reversal of 133186709 is 907681331.

133186709 = 6662² + 6663² + 6664².

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 907681331 = 3343 ⋅271517.

It can be written as a sum of positive squares in 2 ways, for example, as 93219025 + 39967684 = 9655^2 + 6322^2 .

It is a cyclic number.

It is not a de Polignac number, because 133186709 - 2⁴ = 133186693 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133186769) 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 in 3 ways as a sum of consecutive naturals, for example, 145262 + ... + 146175.

It is an arithmetic number, because the mean of its divisors is an integer number (33369651).

Almost surely, 2^133186709 is an apocalyptic number.

It is an amenable number.

133186709 is a deficient number, since it is larger than the sum of its proper divisors (291895).

133186709 is an equidigital number, since it uses as much as digits as its factorization.

133186709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 291894.

The product of its (nonzero) digits is 27216, while the sum is 38.

The square root of 133186709 is about 11540.6546174816. The cubic root of 133186709 is about 510.6856202266.

The spelling of 133186709 in words is "one hundred thirty-three million, one hundred eighty-six thousand, seven hundred nine".