133181331 has 8 divisors (see below), whose sum is σ = 178639104. Its totient is φ = 88255560.

The previous prime is 133181329. The next prime is 133181341.

133181331 is nontrivially palindromic in base 10.

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

It is not a de Polignac number, because 133181331 - 2¹ = 133181329 is a prime.

It is a super-2 number, since 2×133181331² = 35474533853863122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (133181341) 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, 132415 + ... + 133416.

It is an arithmetic number, because the mean of its divisors is an integer number (22329888).

Almost surely, 2^133181331 is an apocalyptic number.

133181331 is a deficient number, since it is larger than the sum of its proper divisors (45457773).

133181331 is a wasteful number, since it uses less digits than its factorization.

133181331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 266001.

The product of its digits is 648, while the sum is 24.

The square root of 133181331 is about 11540.4216127488. The cubic root of 133181331 is about 510.6787464070.

The spelling of 133181331 in words is "one hundred thirty-three million, one hundred eighty-one thousand, three hundred thirty-one".