321031013 has 4 divisors (see below), whose sum is σ = 321148428. Its totient is φ = 320913600.

The previous prime is 321031001. The next prime is 321031019. The reversal of 321031013 is 310130123.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 310130123 = 4271 ⋅72613.

It can be written as a sum of positive squares in 2 ways, for example, as 137780644 + 183250369 = 11738^2 + 13537^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-321031013 is a prime.

It is a super-2 number, since 2×321031013² = 206121822615612338, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (321031019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 54506 + ... + 60107.

It is an arithmetic number, because the mean of its divisors is an integer number (80287107).

Almost surely, 2^321031013 is an apocalyptic number.

It is an amenable number.

321031013 is a deficient number, since it is larger than the sum of its proper divisors (117415).

321031013 is a wasteful number, since it uses less digits than its factorization.

321031013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117414.

The product of its (nonzero) digits is 54, while the sum is 14.

The square root of 321031013 is about 17917.3383346969. The cubic root of 321031013 is about 684.7241775841.

Adding to 321031013 its reverse (310130123), we get a palindrome (631161136).

The spelling of 321031013 in words is "three hundred twenty-one million, thirty-one thousand, thirteen".