133121613 has 8 divisors (see below), whose sum is σ = 177710400. Its totient is φ = 88640288.

The previous prime is 133121579. The next prime is 133121617. The reversal of 133121613 is 316121331.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 133121613 - 2⁸ = 133121357 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 133121613.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133121617) 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 7 ways as a sum of consecutive naturals, for example, 23928 + ... + 28961.

It is an arithmetic number, because the mean of its divisors is an integer number (22213800).

Almost surely, 2^133121613 is an apocalyptic number.

It is an amenable number.

133121613 is a deficient number, since it is larger than the sum of its proper divisors (44588787).

133121613 is an equidigital number, since it uses as much as digits as its factorization.

133121613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53731.

The product of its digits is 324, while the sum is 21.

The square root of 133121613 is about 11537.8339821649. The cubic root of 133121613 is about 510.6024061960.

Adding to 133121613 its reverse (316121331), we get a palindrome (449242944).

The spelling of 133121613 in words is "one hundred thirty-three million, one hundred twenty-one thousand, six hundred thirteen".