9780161 has 4 divisors (see below), whose sum is σ = 9787092. Its totient is φ = 9773232.

The previous prime is 9780157. The next prime is 9780167. The reversal of 9780161 is 1610879.

9780161 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1610879 = 97 ⋅16607.

It can be written as a sum of positive squares in 2 ways, for example, as 5290000 + 4490161 = 2300^2 + 2119^2 .

It is a cyclic number.

It is not a de Polignac number, because 9780161 - 2² = 9780157 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (9780167) 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, 506 + ... + 4451.

It is an arithmetic number, because the mean of its divisors is an integer number (2446773).

Almost surely, 2^9780161 is an apocalyptic number.

It is an amenable number.

9780161 is a deficient number, since it is larger than the sum of its proper divisors (6931).

9780161 is a wasteful number, since it uses less digits than its factorization.

9780161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6930.

The product of its (nonzero) digits is 3024, while the sum is 32.

The square root of 9780161 is about 3127.3248951780. The cubic root of 9780161 is about 213.8529939227.

The spelling of 9780161 in words is "nine million, seven hundred eighty thousand, one hundred sixty-one".