133608811 has 4 divisors (see below), whose sum is σ = 152695792. Its totient is φ = 114521832.

The previous prime is 133608809. The next prime is 133608823. The reversal of 133608811 is 118806331.

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

It is a cyclic number.

It is not a de Polignac number, because 133608811 - 2¹ = 133608809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (133605811) 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, 9543480 + ... + 9543493.

It is an arithmetic number, because the mean of its divisors is an integer number (38173948).

Almost surely, 2^133608811 is an apocalyptic number.

133608811 is a deficient number, since it is larger than the sum of its proper divisors (19086981).

133608811 is an equidigital number, since it uses as much as digits as its factorization.

133608811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19086980.

The product of its (nonzero) digits is 3456, while the sum is 31.

The square root of 133608811 is about 11558.9277616914. The cubic root of 133608811 is about 511.2245481239.

The spelling of 133608811 in words is "one hundred thirty-three million, six hundred eight thousand, eight hundred eleven".