133606331 has 4 divisors (see below), whose sum is σ = 136865064. Its totient is φ = 130347600.

The previous prime is 133606313. The next prime is 133606337.

133606331 is nontrivially palindromic in base 10.

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 133606331 - 2¹⁸ = 133344187 is a prime.

It is a super-2 number, since 2×133606331² = 35701303366563122, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 133606331.

It is not an unprimeable number, because it can be changed into a prime (133606337) 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, 1629305 + ... + 1629386.

It is an arithmetic number, because the mean of its divisors is an integer number (34216266).

Almost surely, 2^133606331 is an apocalyptic number.

133606331 is a deficient number, since it is larger than the sum of its proper divisors (3258733).

133606331 is an equidigital number, since it uses as much as digits as its factorization.

133606331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3258732.

The product of its (nonzero) digits is 2916, while the sum is 26.

The square root of 133606331 is about 11558.8204848073. The cubic root of 133606331 is about 511.2213850472.

It can be divided in two parts, 13360 and 6331, that added together give a palindrome (19691).

The spelling of 133606331 in words is "one hundred thirty-three million, six hundred six thousand, three hundred thirty-one".