978422161 has 2 divisors, whose sum is σ = 978422162. Its totient is φ = 978422160.

The previous prime is 978422153. The next prime is 978422183. The reversal of 978422161 is 161224879.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 947408400 + 31013761 = 30780^2 + 5569^2 .

It is an emirp because it is prime and its reverse (161224879) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 978422161 - 2³ = 978422153 is a prime.

It is not a weakly prime, because it can be changed into another prime (978422261) 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 as a sum of consecutive naturals, namely, 489211080 + 489211081.

It is an arithmetic number, because the mean of its divisors is an integer number (489211081).

Almost surely, 2^978422161 is an apocalyptic number.

It is an amenable number.

978422161 is a deficient number, since it is larger than the sum of its proper divisors (1).

978422161 is an equidigital number, since it uses as much as digits as its factorization.

978422161 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 48384, while the sum is 40.

The square root of 978422161 is about 31279.7404241148. The cubic root of 978422161 is about 992.7550240862.

The spelling of 978422161 in words is "nine hundred seventy-eight million, four hundred twenty-two thousand, one hundred sixty-one".