133613987 has 8 divisors (see below), whose sum is σ = 143988096. Its totient is φ = 123253632.

The previous prime is 133613983. The next prime is 133613989. The reversal of 133613987 is 789316331.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 133613987 - 2² = 133613983 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (133613983) 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 7 ways as a sum of consecutive naturals, for example, 26363 + ... + 31019.

It is an arithmetic number, because the mean of its divisors is an integer number (17998512).

Almost surely, 2^133613987 is an apocalyptic number.

133613987 is a deficient number, since it is larger than the sum of its proper divisors (10374109).

133613987 is a wasteful number, since it uses less digits than its factorization.

133613987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6877.

The product of its digits is 81648, while the sum is 41.

The square root of 133613987 is about 11559.1516557228. The cubic root of 133613987 is about 511.2311496448.

The spelling of 133613987 in words is "one hundred thirty-three million, six hundred thirteen thousand, nine hundred eighty-seven".