133051987 has 4 divisors (see below), whose sum is σ = 138836880. Its totient is φ = 127267096.

The previous prime is 133051967. The next prime is 133051991. The reversal of 133051987 is 789150331.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 789150331 = 691 ⋅1142041.

It is not a de Polignac number, because 133051987 - 2⁷ = 133051859 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (133051957) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2892412 + ... + 2892457.

It is an arithmetic number, because the mean of its divisors is an integer number (34709220).

Almost surely, 2^133051987 is an apocalyptic number.

133051987 is a deficient number, since it is larger than the sum of its proper divisors (5784893).

133051987 is an equidigital number, since it uses as much as digits as its factorization.

133051987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5784892.

The product of its (nonzero) digits is 22680, while the sum is 37.

The square root of 133051987 is about 11534.8162967600. The cubic root of 133051987 is about 510.5133713098.

The spelling of 133051987 in words is "one hundred thirty-three million, fifty-one thousand, nine hundred eighty-seven".