31313321 has 8 divisors (see below), whose sum is σ = 34226304. Its totient is φ = 28472400.

The previous prime is 31313297. The next prime is 31313351. The reversal of 31313321 is 12331313.

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 31313321 - 2⁶ = 31313257 is a prime.

It is a Duffinian number.

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 31313321.

It is not an unprimeable number, because it can be changed into a prime (31313351) 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, 17105 + ... + 18846.

It is an arithmetic number, because the mean of its divisors is an integer number (4278288).

Almost surely, 2^31313321 is an apocalyptic number.

It is an amenable number.

31313321 is a deficient number, since it is larger than the sum of its proper divisors (2912983).

31313321 is a wasteful number, since it uses less digits than its factorization.

31313321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36031.

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

The square root of 31313321 is about 5595.8306800689. The cubic root of 31313321 is about 315.1928641708.

Adding to 31313321 its reverse (12331313), we get a palindrome (43644634).

The spelling of 31313321 in words is "thirty-one million, three hundred thirteen thousand, three hundred twenty-one".