997031384161 has 4 divisors (see below), whose sum is σ = 997033690132. Its totient is φ = 997029078192.

The previous prime is 997031384143. The next prime is 997031384183. The reversal of 997031384161 is 161483130799.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 161483130799 = 27337 ⋅5907127.

It can be written as a sum of positive squares in 2 ways, for example, as 768986932561 + 228044451600 = 876919^2 + 477540^2 .

It is a 3-Lehmer number, since φ(997031384161) divides (997031384161-1)³.

It is a cyclic number.

It is not a de Polignac number, because 997031384161 - 2¹⁷ = 997031253089 is a prime.

It is a deceptive number, since it divides R_997031384160.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 997031384099 and 997031384108.

It is not an unprimeable number, because it can be changed into a prime (997031384761) 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, 288246 + ... + 1441231.

It is an arithmetic number, because the mean of its divisors is an integer number (249258422533).

It is a Poulet number, since it divides 2^997031384160-1.

Almost surely, 2^997031384161 is an apocalyptic number.

997031384161 is the 576493-rd octagonal number.

It is an amenable number.

997031384161 is a deficient number, since it is larger than the sum of its proper divisors (2305971).

997031384161 is a wasteful number, since it uses less digits than its factorization.

997031384161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2305970.

The product of its (nonzero) digits is 979776, while the sum is 52.

The spelling of 997031384161 in words is "nine hundred ninety-seven billion, thirty-one million, three hundred eighty-four thousand, one hundred sixty-one".