78969559 has 2 divisors, whose sum is σ = 78969560. Its totient is φ = 78969558.

The previous prime is 78969521. The next prime is 78969593. The reversal of 78969559 is 95596987.

It is a strong prime.

It is an emirp because it is prime and its reverse (95596987) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78969559 - 2¹⁹ = 78445271 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78969659) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39484779 + 39484780.

It is an arithmetic number, because the mean of its divisors is an integer number (39484780).

Almost surely, 2^78969559 is an apocalyptic number.

78969559 is a deficient number, since it is larger than the sum of its proper divisors (1).

78969559 is an equidigital number, since it uses as much as digits as its factorization.

78969559 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6123600, while the sum is 58.

The square root of 78969559 is about 8886.4818122809. The cubic root of 78969559 is about 429.0289227643.

The spelling of 78969559 in words is "seventy-eight million, nine hundred sixty-nine thousand, five hundred fifty-nine".