1312543221 has 8 divisors (see below), whose sum is σ = 1909153824. Its totient is φ = 795480720.

The previous prime is 1312543187. The next prime is 1312543241. The reversal of 1312543221 is 1223452131.

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

It is not a de Polignac number, because 1312543221 - 2⁹ = 1312542709 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1312543191 and 1312543200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1312543241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19886986 + ... + 19887051.

It is an arithmetic number, because the mean of its divisors is an integer number (238644228).

Almost surely, 2^1312543221 is an apocalyptic number.

1312543221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1312543221 is a deficient number, since it is larger than the sum of its proper divisors (596610603).

1312543221 is a wasteful number, since it uses less digits than its factorization.

1312543221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39774051.

The product of its digits is 1440, while the sum is 24.

The square root of 1312543221 is about 36229.0383670337. The cubic root of 1312543221 is about 1094.8918030748.

Adding to 1312543221 its reverse (1223452131), we get a palindrome (2535995352).

The spelling of 1312543221 in words is "one billion, three hundred twelve million, five hundred forty-three thousand, two hundred twenty-one".