133346681 has 4 divisors (see below), whose sum is σ = 143604132. Its totient is φ = 123089232.

The previous prime is 133346677. The next prime is 133346687. The reversal of 133346681 is 186643331.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 186643331 = 7 ⋅26663333.

It can be written as a sum of positive squares in 2 ways, for example, as 64722025 + 68624656 = 8045^2 + 8284^2 .

It is a cyclic number.

It is not a de Polignac number, because 133346681 - 2² = 133346677 is a prime.

It is a super-2 number, since 2×133346681² = 35562674667431522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (133346687) 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, 5128706 + ... + 5128731.

It is an arithmetic number, because the mean of its divisors is an integer number (35901033).

Almost surely, 2^133346681 is an apocalyptic number.

It is an amenable number.

133346681 is a deficient number, since it is larger than the sum of its proper divisors (10257451).

133346681 is a wasteful number, since it uses less digits than its factorization.

133346681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10257450.

The product of its digits is 31104, while the sum is 35.

The square root of 133346681 is about 11547.5833402492. The cubic root of 133346681 is about 510.8900017650.

The spelling of 133346681 in words is "one hundred thirty-three million, three hundred forty-six thousand, six hundred eighty-one".