997893383391 has 24 divisors (see below), whose sum is σ = 1558271959920. Its totient is φ = 613214706816.

The previous prime is 997893383381. The next prime is 997893383437. The reversal of 997893383391 is 193383398799.

997893383391 is a `hidden beast` number, since 9 + 9 + 78 + 93 + 3 + 83 + 391 = 666.

It is not a de Polignac number, because 997893383391 - 2¹⁴ = 997893367007 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (997893383381) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 78853590 + ... + 78866243.

It is an arithmetic number, because the mean of its divisors is an integer number (64927998330).

Almost surely, 2^997893383391 is an apocalyptic number.

997893383391 is a deficient number, since it is larger than the sum of its proper divisors (560378576529).

997893383391 is a wasteful number, since it uses less digits than its factorization.

997893383391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157719895 (or 157719892 counting only the distinct ones).

The product of its digits is 238085568, while the sum is 72.

The spelling of 997893383391 in words is "nine hundred ninety-seven billion, eight hundred ninety-three million, three hundred eighty-three thousand, three hundred ninety-one".