133326681 has 4 divisors (see below), whose sum is σ = 177768912. Its totient is φ = 88884452.

The previous prime is 133326647. The next prime is 133326701. The reversal of 133326681 is 186623331.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 133326681 - 2¹⁰ = 133325657 is a prime.

It is a super-2 number, since 2×133326681² = 35552007732951522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (133326481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22221111 + ... + 22221116.

It is an arithmetic number, because the mean of its divisors is an integer number (44442228).

Almost surely, 2^133326681 is an apocalyptic number.

It is an amenable number.

133326681 is a deficient number, since it is larger than the sum of its proper divisors (44442231).

133326681 is an equidigital number, since it uses as much as digits as its factorization.

133326681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44442230.

The product of its digits is 15552, while the sum is 33.

The square root of 133326681 is about 11546.7173257164. The cubic root of 133326681 is about 510.8644585448.

The spelling of 133326681 in words is "one hundred thirty-three million, three hundred twenty-six thousand, six hundred eighty-one".