1213323443 has 4 divisors (see below), whose sum is σ = 1214321640. Its totient is φ = 1212325248.

The previous prime is 1213323427. The next prime is 1213323467. The reversal of 1213323443 is 3443233121.

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

It is a cyclic number.

It is not a de Polignac number, because 1213323443 - 2⁴ = 1213323427 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1213323493) 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, 497273 + ... + 499706.

It is an arithmetic number, because the mean of its divisors is an integer number (303580410).

Almost surely, 2^1213323443 is an apocalyptic number.

1213323443 is a deficient number, since it is larger than the sum of its proper divisors (998197).

1213323443 is an equidigital number, since it uses as much as digits as its factorization.

1213323443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 998196.

The product of its digits is 5184, while the sum is 26.

The square root of 1213323443 is about 34832.7926385468. The cubic root of 1213323443 is about 1066.5769560077.

Adding to 1213323443 its reverse (3443233121), we get a palindrome (4656556564).

The spelling of 1213323443 in words is "one billion, two hundred thirteen million, three hundred twenty-three thousand, four hundred forty-three".