133171009 has 16 divisors (see below), whose sum is σ = 141170176. Its totient is φ = 125452800.

The previous prime is 133171007. The next prime is 133171021. The reversal of 133171009 is 900171331.

It is a cyclic number.

It is not a de Polignac number, because 133171009 - 2¹ = 133171007 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (133171001) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 201139 + ... + 201799.

It is an arithmetic number, because the mean of its divisors is an integer number (8823136).

Almost surely, 2^133171009 is an apocalyptic number.

It is an amenable number.

133171009 is a deficient number, since it is larger than the sum of its proper divisors (7999167).

133171009 is an equidigital number, since it uses as much as digits as its factorization.

133171009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 856.

The product of its (nonzero) digits is 567, while the sum is 25.

The square root of 133171009 is about 11539.9743933858. The cubic root of 133171009 is about 510.6655529607.

The spelling of 133171009 in words is "one hundred thirty-three million, one hundred seventy-one thousand, nine".