1323631513 has 4 divisors (see below), whose sum is σ = 1323740880. Its totient is φ = 1323522148.

The previous prime is 1323631511. The next prime is 1323631549. The reversal of 1323631513 is 3151363231.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 3151363231 = 43 ⋅73287517.

It is a cyclic number.

It is not a de Polignac number, because 1323631513 - 2¹ = 1323631511 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1323631511) 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, 33895 + ... + 61612.

It is an arithmetic number, because the mean of its divisors is an integer number (330935220).

Almost surely, 2^1323631513 is an apocalyptic number.

It is an amenable number.

1323631513 is a deficient number, since it is larger than the sum of its proper divisors (109367).

1323631513 is an equidigital number, since it uses as much as digits as its factorization.

1323631513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109366.

The product of its digits is 4860, while the sum is 28.

The square root of 1323631513 is about 36381.7469756470. The cubic root of 1323631513 is about 1097.9663563579.

Adding to 1323631513 its reverse (3151363231), we get a palindrome (4474994744).

The spelling of 1323631513 in words is "one billion, three hundred twenty-three million, six hundred thirty-one thousand, five hundred thirteen".