133171507 has 4 divisors (see below), whose sum is σ = 152196016. Its totient is φ = 114147000.

The previous prime is 133171483. The next prime is 133171529. The reversal of 133171507 is 705171331.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 705171331 = 499 ⋅1413169.

It is a cyclic number.

It is not a de Polignac number, because 133171507 - 2¹⁹ = 132647219 is a prime.

It is not an unprimeable number, because it can be changed into a prime (133171007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9512244 + ... + 9512257.

It is an arithmetic number, because the mean of its divisors is an integer number (38049004).

Almost surely, 2^133171507 is an apocalyptic number.

133171507 is a deficient number, since it is larger than the sum of its proper divisors (19024509).

133171507 is an equidigital number, since it uses as much as digits as its factorization.

133171507 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19024508.

The product of its (nonzero) digits is 2205, while the sum is 28.

The square root of 133171507 is about 11539.9959705366. The cubic root of 133171507 is about 510.6661895135. Note that the first 3 decimals are identical.

The spelling of 133171507 in words is "one hundred thirty-three million, one hundred seventy-one thousand, five hundred seven".