478677191 has 2 divisors, whose sum is σ = 478677192. Its totient is φ = 478677190.

The previous prime is 478677179. The next prime is 478677193. The reversal of 478677191 is 191776874.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-478677191 is a prime.

Together with 478677193, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (478677193) 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, 239338595 + 239338596.

It is an arithmetic number, because the mean of its divisors is an integer number (239338596).

Almost surely, 2^478677191 is an apocalyptic number.

478677191 is a deficient number, since it is larger than the sum of its proper divisors (1).

478677191 is an equidigital number, since it uses as much as digits as its factorization.

478677191 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 592704, while the sum is 50.

The square root of 478677191 is about 21878.6926254747. The cubic root of 478677191 is about 782.2536134256.

The spelling of 478677191 in words is "four hundred seventy-eight million, six hundred seventy-seven thousand, one hundred ninety-one".