78017089 has 2 divisors, whose sum is σ = 78017090. Its totient is φ = 78017088.

The previous prime is 78016999. The next prime is 78017099. The reversal of 78017089 is 98071087.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 47679025 + 30338064 = 6905^2 + 5508^2 .

It is an emirp because it is prime and its reverse (98071087) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78017089 - 2¹³ = 78008897 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (78017099) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39008544 + 39008545.

It is an arithmetic number, because the mean of its divisors is an integer number (39008545).

Almost surely, 2^78017089 is an apocalyptic number.

It is an amenable number.

78017089 is a deficient number, since it is larger than the sum of its proper divisors (1).

78017089 is an equidigital number, since it uses as much as digits as its factorization.

78017089 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 28224, while the sum is 40.

The square root of 78017089 is about 8832.7282874546. The cubic root of 78017089 is about 427.2970690811.

The spelling of 78017089 in words is "seventy-eight million, seventeen thousand, eighty-nine".