78608191 has 2 divisors, whose sum is σ = 78608192. Its totient is φ = 78608190.

The previous prime is 78608137. The next prime is 78608213. The reversal of 78608191 is 19180687.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 78608191 - 2⁹ = 78607679 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78608291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39304095 + 39304096.

It is an arithmetic number, because the mean of its divisors is an integer number (39304096).

Almost surely, 2^78608191 is an apocalyptic number.

78608191 is a deficient number, since it is larger than the sum of its proper divisors (1).

78608191 is an equidigital number, since it uses as much as digits as its factorization.

78608191 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24192, while the sum is 40.

The square root of 78608191 is about 8866.1260424156. The cubic root of 78608191 is about 428.3735039146.

The spelling of 78608191 in words is "seventy-eight million, six hundred eight thousand, one hundred ninety-one".