133031321 has 8 divisors (see below), whose sum is σ = 134863680. Its totient is φ = 131204592.

The previous prime is 133031299. The next prime is 133031377. The reversal of 133031321 is 123130331.

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 133031321 - 2⁶ = 133031257 is a prime.

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 133031321.

It is not an unprimeable number, because it can be changed into a prime (133031221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 69860 + ... + 71738.

It is an arithmetic number, because the mean of its divisors is an integer number (16857960).

Almost surely, 2^133031321 is an apocalyptic number.

It is an amenable number.

133031321 is a deficient number, since it is larger than the sum of its proper divisors (1832359).

133031321 is an equidigital number, since it uses as much as digits as its factorization.

133031321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2815.

The product of its (nonzero) digits is 162, while the sum is 17.

The square root of 133031321 is about 11533.9204523007. The cubic root of 133031321 is about 510.4869384950.

Adding to 133031321 its reverse (123130331), we get a palindrome (256161652).

The spelling of 133031321 in words is "one hundred thirty-three million, thirty-one thousand, three hundred twenty-one".