133811087 has 4 divisors (see below), whose sum is σ = 134027880. Its totient is φ = 133594296.

The previous prime is 133811077. The next prime is 133811099. The reversal of 133811087 is 780118331.

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 133811087 - 2⁴ = 133811071 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 (133811047) 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, 107468 + ... + 108705.

It is an arithmetic number, because the mean of its divisors is an integer number (33506970).

Almost surely, 2^133811087 is an apocalyptic number.

133811087 is a deficient number, since it is larger than the sum of its proper divisors (216793).

133811087 is an equidigital number, since it uses as much as digits as its factorization.

133811087 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 216792.

The product of its (nonzero) digits is 4032, while the sum is 32.

The square root of 133811087 is about 11567.6742260491. The cubic root of 133811087 is about 511.4824061573.

The spelling of 133811087 in words is "one hundred thirty-three million, eight hundred eleven thousand, eighty-seven".