133033987 has 4 divisors (see below), whose sum is σ = 134005176. Its totient is φ = 132062800.

The previous prime is 133033973. The next prime is 133034003. The reversal of 133033987 is 789330331.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 789330331 = 149 ⋅5297519.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-133033987 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (133033937) 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, 485389 + ... + 485662.

It is an arithmetic number, because the mean of its divisors is an integer number (33501294).

Almost surely, 2^133033987 is an apocalyptic number.

133033987 is a deficient number, since it is larger than the sum of its proper divisors (971189).

133033987 is an equidigital number, since it uses as much as digits as its factorization.

133033987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 971188.

The product of its (nonzero) digits is 40824, while the sum is 37.

The square root of 133033987 is about 11534.0360238730. The cubic root of 133033987 is about 510.4903485919.

The spelling of 133033987 in words is "one hundred thirty-three million, thirty-three thousand, nine hundred eighty-seven".