1313431221 has 8 divisors (see below), whose sum is σ = 1843412320. Its totient is φ = 829535472.

The previous prime is 1313431211. The next prime is 1313431241. The reversal of 1313431221 is 1221343131.

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

It is not a de Polignac number, because 1313431221 - 2¹⁰ = 1313430197 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1313431211) 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, 11521270 + ... + 11521383.

It is an arithmetic number, because the mean of its divisors is an integer number (230426540).

Almost surely, 2^1313431221 is an apocalyptic number.

It is an amenable number.

1313431221 is a deficient number, since it is larger than the sum of its proper divisors (529981099).

1313431221 is a wasteful number, since it uses less digits than its factorization.

1313431221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23042675.

The product of its digits is 432, while the sum is 21.

The square root of 1313431221 is about 36241.2916574451. The cubic root of 1313431221 is about 1095.1386634515.

Adding to 1313431221 its reverse (1221343131), we get a palindrome (2534774352).

The spelling of 1313431221 in words is "one billion, three hundred thirteen million, four hundred thirty-one thousand, two hundred twenty-one".