9931097861397 has 144 divisors (see below), whose sum is σ = 17033796037440. Its totient is φ = 5754785895936.

The previous prime is 9931097861389. The next prime is 9931097861407. The reversal of 9931097861397 is 7931687901399.

9931097861397 is a `hidden beast` number, since 9 + 9 + 3 + 109 + 78 + 61 + 397 = 666.

It is not a de Polignac number, because 9931097861397 - 2³ = 9931097861389 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9931097861317) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 63295318 + ... + 63452024.

It is an arithmetic number, because the mean of its divisors is an integer number (118290250260).

Almost surely, 2^{9931097861397} is an apocalyptic number.

It is an amenable number.

9931097861397 is a deficient number, since it is larger than the sum of its proper divisors (7102698176043).

9931097861397 is a wasteful number, since it uses less digits than its factorization.

9931097861397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 156814 (or 156779 counting only the distinct ones).

The product of its (nonzero) digits is 138883248, while the sum is 72.

The spelling of 9931097861397 in words is "nine trillion, nine hundred thirty-one billion, ninety-seven million, eight hundred sixty-one thousand, three hundred ninety-seven".