133215331 has 4 divisors (see below), whose sum is σ = 134437600. Its totient is φ = 131993064.

The previous prime is 133215319. The next prime is 133215337. The reversal of 133215331 is 133512331.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 133512331 = 239 ⋅558629.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-133215331 is a prime.

It is a super-2 number, since 2×133215331² = 35492648826879122, which contains 22 as substring.

It is a Duffinian number.

It is a nialpdrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (133215337) 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, 610971 + ... + 611188.

It is an arithmetic number, because the mean of its divisors is an integer number (33609400).

Almost surely, 2^133215331 is an apocalyptic number.

133215331 is a deficient number, since it is larger than the sum of its proper divisors (1222269).

133215331 is a wasteful number, since it uses less digits than its factorization.

133215331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1222268.

The product of its digits is 810, while the sum is 22.

The square root of 133215331 is about 11541.8946018407. The cubic root of 133215331 is about 510.7221999449.

Adding to 133215331 its reverse (133512331), we get a palindrome (266727662).

The spelling of 133215331 in words is "one hundred thirty-three million, two hundred fifteen thousand, three hundred thirty-one".