1321312736 has 24 divisors (see below), whose sum is σ = 2607287760. Its totient is φ = 659144448.

The previous prime is 1321312697. The next prime is 1321312807. The reversal of 1321312736 is 6372131231.

It is a junction number, because it is equal to n+sod(n) for n = 1321312699 and 1321312708.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32981 + ... + 61076.

It is an arithmetic number, because the mean of its divisors is an integer number (108636990).

Almost surely, 2^1321312736 is an apocalyptic number.

1321312736 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1321312736 is a deficient number, since it is larger than the sum of its proper divisors (1285975024).

1321312736 is an equidigital number, since it uses as much as digits as its factorization.

1321312736 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94506 (or 94498 counting only the distinct ones).

The product of its digits is 4536, while the sum is 29.

The square root of 1321312736 is about 36349.8656943874. The cubic root of 1321312736 is about 1097.3248315727.

Adding to 1321312736 its reverse (6372131231), we get a palindrome (7693443967).

The spelling of 1321312736 in words is "one billion, three hundred twenty-one million, three hundred twelve thousand, seven hundred thirty-six".