1321310656 has 28 divisors (see below), whose sum is σ = 2623235800. Its totient is φ = 660337920.

The previous prime is 1321310621. The next prime is 1321310659. The reversal of 1321310656 is 6560131231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321310659) by changing a digit.

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, 186670 + ... + 193618.

Almost surely, 2^1321310656 is an apocalyptic number.

1321310656 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1321310656 is a deficient number, since it is larger than the sum of its proper divisors (1301925144).

1321310656 is an equidigital number, since it uses as much as digits as its factorization.

1321310656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9932 (or 9922 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 28.

The square root of 1321310656 is about 36349.8370835414. The cubic root of 1321310656 is about 1097.3242557723.

Adding to 1321310656 its reverse (6560131231), we get a palindrome (7881441887).

The spelling of 1321310656 in words is "one billion, three hundred twenty-one million, three hundred ten thousand, six hundred fifty-six".