133143331 has 4 divisors (see below), whose sum is σ = 133169832. Its totient is φ = 133116832.

The previous prime is 133143323. The next prime is 133143347. The reversal of 133143331 is 133341331.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 133143331 - 2³ = 133143323 is a prime.

It is a super-2 number, since 2×133143331² = 35454293179551122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (133143301) 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, 3145 + ... + 16618.

It is an arithmetic number, because the mean of its divisors is an integer number (33292458).

Almost surely, 2^133143331 is an apocalyptic number.

133143331 is a deficient number, since it is larger than the sum of its proper divisors (26501).

133143331 is an equidigital number, since it uses as much as digits as its factorization.

133143331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26500.

The product of its digits is 972, while the sum is 22.

The square root of 133143331 is about 11538.7751083033. The cubic root of 133143331 is about 510.6301719355.

Adding to 133143331 its reverse (133341331), we get a palindrome (266484662).

The spelling of 133143331 in words is "one hundred thirty-three million, one hundred forty-three thousand, three hundred thirty-one".