133521171 has 8 divisors (see below), whose sum is σ = 203460864. Its totient is φ = 76297800.

The previous prime is 133521163. The next prime is 133521203. The reversal of 133521171 is 171125331.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 133521171 - 2³ = 133521163 is a prime.

It is a super-2 number, since 2×133521171² = 35655806210422482, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (133521571) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3179055 + ... + 3179096.

It is an arithmetic number, because the mean of its divisors is an integer number (25432608).

Almost surely, 2^133521171 is an apocalyptic number.

133521171 is a deficient number, since it is larger than the sum of its proper divisors (69939693).

133521171 is an equidigital number, since it uses as much as digits as its factorization.

133521171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6358161.

The product of its digits is 630, while the sum is 24.

The square root of 133521171 is about 11555.1361307429. The cubic root of 133521171 is about 511.1127453196.

The spelling of 133521171 in words is "one hundred thirty-three million, five hundred twenty-one thousand, one hundred seventy-one".