1213323563 has 4 divisors (see below), whose sum is σ = 1220337168. Its totient is φ = 1206309960.

The previous prime is 1213323533. The next prime is 1213323673. The reversal of 1213323563 is 3653233121.

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 1213323563 - 2²⁴ = 1196546347 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1213323533) 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, 3506543 + ... + 3506888.

It is an arithmetic number, because the mean of its divisors is an integer number (305084292).

Almost surely, 2^1213323563 is an apocalyptic number.

1213323563 is a deficient number, since it is larger than the sum of its proper divisors (7013605).

1213323563 is an equidigital number, since it uses as much as digits as its factorization.

1213323563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7013604.

The product of its digits is 9720, while the sum is 29.

The square root of 1213323563 is about 34832.7943610615. The cubic root of 1213323563 is about 1066.5769911699.

Adding to 1213323563 its reverse (3653233121), we get a palindrome (4866556684).

The spelling of 1213323563 in words is "one billion, two hundred thirteen million, three hundred twenty-three thousand, five hundred sixty-three".