1310721616 has 20 divisors (see below), whose sum is σ = 2540214400. Its totient is φ = 655182432.

The previous prime is 1310721611. The next prime is 1310721667. The reversal of 1310721616 is 6161270131.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1310721611) 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, 65395 + ... + 83053.

It is an arithmetic number, because the mean of its divisors is an integer number (127010720).

Almost surely, 2^1310721616 is an apocalyptic number.

1310721616 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1310721616 is a deficient number, since it is larger than the sum of its proper divisors (1229492784).

1310721616 is a wasteful number, since it uses less digits than its factorization.

1310721616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22306 (or 22300 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 28.

The square root of 1310721616 is about 36203.8895148021. The cubic root of 1310721616 is about 1094.3850556322.

Adding to 1310721616 its reverse (6161270131), we get a palindrome (7471991747).

The spelling of 1310721616 in words is "one billion, three hundred ten million, seven hundred twenty-one thousand, six hundred sixteen".