133575987 has 16 divisors (see below), whose sum is σ = 189090720. Its totient is φ = 83584512.

The previous prime is 133575983. The next prime is 133575989. The reversal of 133575987 is 789575331.

It is not a de Polignac number, because 133575987 - 2² = 133575983 is a prime.

It is not an unprimeable number, because it can be changed into a prime (133575983) 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 15 ways as a sum of consecutive naturals, for example, 16473 + ... + 23205.

It is an arithmetic number, because the mean of its divisors is an integer number (11818170).

Almost surely, 2^133575987 is an apocalyptic number.

133575987 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

133575987 is a deficient number, since it is larger than the sum of its proper divisors (55514733).

133575987 is a wasteful number, since it uses less digits than its factorization.

133575987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7142.

The product of its digits is 793800, while the sum is 48.

The square root of 133575987 is about 11557.5078195950. The cubic root of 133575987 is about 511.1826801044.

The spelling of 133575987 in words is "one hundred thirty-three million, five hundred seventy-five thousand, nine hundred eighty-seven".