1331591370916 has 27 divisors (see below), whose sum is σ = 2459467547019. Its totient is φ = 630733036248.

The previous prime is 1331591370899. The next prime is 1331591370937. The reversal of 1331591370916 is 6190731951331.

The square root of 1331591370916 is 1153946.

It is a perfect power (a square), and thus also a powerful number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1331591370916.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 43834765 + ... + 43865131.

Almost surely, 2^{1331591370916} is an apocalyptic number.

1331591370916 is the 1153946-th square number.

It is an amenable number.

1331591370916 is a deficient number, since it is larger than the sum of its proper divisors (1127876176103).

1331591370916 is an frugal number, since it uses more digits than its factorization.

1331591370916 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60776 (or 30388 counting only the distinct ones).

The product of its (nonzero) digits is 459270, while the sum is 49.

Multiplying 1331591370916 by its sum of digits (49), we get a square (65247977174884 = 8077622²).

The spelling of 1331591370916 in words is "one trillion, three hundred thirty-one billion, five hundred ninety-one million, three hundred seventy thousand, nine hundred sixteen".