78884161 has 2 divisors, whose sum is σ = 78884162. Its totient is φ = 78884160.

The previous prime is 78884159. The next prime is 78884207. The reversal of 78884161 is 16148887.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 78588225 + 295936 = 8865^2 + 544^2 .

It is an emirp because it is prime and its reverse (16148887) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78884161 - 2¹ = 78884159 is a prime.

Together with 78884159, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (78884261) 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, 39442080 + 39442081.

It is an arithmetic number, because the mean of its divisors is an integer number (39442081).

Almost surely, 2^78884161 is an apocalyptic number.

It is an amenable number.

78884161 is a deficient number, since it is larger than the sum of its proper divisors (1).

78884161 is an equidigital number, since it uses as much as digits as its factorization.

78884161 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 86016, while the sum is 43.

The square root of 78884161 is about 8881.6755738993. The cubic root of 78884161 is about 428.8742157807.

The spelling of 78884161 in words is "seventy-eight million, eight hundred eighty-four thousand, one hundred sixty-one".