133166387 has 4 divisors (see below), whose sum is σ = 133207536. Its totient is φ = 133125240.

The previous prime is 133166357. The next prime is 133166413. The reversal of 133166387 is 783661331.

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 133166387 - 2⁶ = 133166323 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 133166387.

It is not an unprimeable number, because it can be changed into a prime (133166357) 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, 15263 + ... + 22344.

It is an arithmetic number, because the mean of its divisors is an integer number (33301884).

Almost surely, 2^133166387 is an apocalyptic number.

133166387 is a deficient number, since it is larger than the sum of its proper divisors (41149).

133166387 is an equidigital number, since it uses as much as digits as its factorization.

133166387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41148.

The product of its digits is 54432, while the sum is 38.

The square root of 133166387 is about 11539.7741312384. The cubic root of 133166387 is about 510.6596449594.

The spelling of 133166387 in words is "one hundred thirty-three million, one hundred sixty-six thousand, three hundred eighty-seven".