331131301321 has 4 divisors (see below), whose sum is σ = 331285965444. Its totient is φ = 330976637200.

The previous prime is 331131301307. The next prime is 331131301327. The reversal of 331131301321 is 123103131133.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 231034996921 + 100096304400 = 480661^2 + 316380^2 .

It is a cyclic number.

It is not a de Polignac number, because 331131301321 - 2⁵ = 331131301289 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 331131301292 and 331131301301.

It is not an unprimeable number, because it can be changed into a prime (331131301327) 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, 77328850 + ... + 77333131.

It is an arithmetic number, because the mean of its divisors is an integer number (82821491361).

Almost surely, 2^331131301321 is an apocalyptic number.

It is an amenable number.

331131301321 is a deficient number, since it is larger than the sum of its proper divisors (154664123).

331131301321 is a wasteful number, since it uses less digits than its factorization.

331131301321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 154664122.

The product of its (nonzero) digits is 486, while the sum is 22.

Adding to 331131301321 its reverse (123103131133), we get a palindrome (454234432454).

The spelling of 331131301321 in words is "three hundred thirty-one billion, one hundred thirty-one million, three hundred one thousand, three hundred twenty-one".