133667609 has 2 divisors, whose sum is σ = 133667610. Its totient is φ = 133667608.

The previous prime is 133667591. The next prime is 133667621. The reversal of 133667609 is 906766331.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 131171209 + 2496400 = 11453^2 + 1580^2 .

It is an emirp because it is prime and its reverse (906766331) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 133667609 - 2⁸ = 133667353 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (133667669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66833804 + 66833805.

It is an arithmetic number, because the mean of its divisors is an integer number (66833805).

Almost surely, 2^133667609 is an apocalyptic number.

It is an amenable number.

133667609 is a deficient number, since it is larger than the sum of its proper divisors (1).

133667609 is an equidigital number, since it uses as much as digits as its factorization.

133667609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 122472, while the sum is 41.

The square root of 133667609 is about 11561.4708839317. The cubic root of 133667609 is about 511.2995296375.

The spelling of 133667609 in words is "one hundred thirty-three million, six hundred sixty-seven thousand, six hundred nine".