133170187 has 4 divisors (see below), whose sum is σ = 133455816. Its totient is φ = 132884560.

The previous prime is 133170133. The next prime is 133170199. The reversal of 133170187 is 781071331.

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 133170187 - 2¹⁵ = 133137419 is a prime.

It is a super-2 number, since 2×133170187² = 35468597411229938, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (133170127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 142114 + ... + 143047.

It is an arithmetic number, because the mean of its divisors is an integer number (33363954).

Almost surely, 2^133170187 is an apocalyptic number.

133170187 is a deficient number, since it is larger than the sum of its proper divisors (285629).

133170187 is an equidigital number, since it uses as much as digits as its factorization.

133170187 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 285628.

The product of its (nonzero) digits is 3528, while the sum is 31.

The square root of 133170187 is about 11539.9387780005. The cubic root of 133170187 is about 510.6645022617.

The spelling of 133170187 in words is "one hundred thirty-three million, one hundred seventy thousand, one hundred eighty-seven".