978161 has 6 divisors (see below), whose sum is σ = 998562. Its totient is φ = 958160.

The previous prime is 978157. The next prime is 978179. The reversal of 978161 is 161879.

It can be written as a sum of positive squares in only one way, i.e., 891136 + 87025 = 944^2 + 295^2 .

It is not a de Polignac number, because 978161 - 2² = 978157 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 (978151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3341 + ... + 3621.

It is an arithmetic number, because the mean of its divisors is an integer number (166427).

2⁹⁷⁸¹⁶¹ is an apocalyptic number.

It is an amenable number.

978161 is a deficient number, since it is larger than the sum of its proper divisors (20401).

978161 is an equidigital number, since it uses as much as digits as its factorization.

978161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 399 (or 340 counting only the distinct ones).

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

The square root of 978161 is about 989.0202222402. The cubic root of 978161 is about 99.2666687314.

The spelling of 978161 in words is "nine hundred seventy-eight thousand, one hundred sixty-one".