478674191 has 2 divisors, whose sum is σ = 478674192. Its totient is φ = 478674190.

The previous prime is 478674173. The next prime is 478674199. The reversal of 478674191 is 191476874.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-478674191 is a prime.

It is a super-2 number, since 2×478674191² = 458257962259008962, which contains 22 as substring.

It is equal to p_25289876 and since 478674191 and 25289876 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (478674199) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 239337095 + 239337096.

It is an arithmetic number, because the mean of its divisors is an integer number (239337096).

Almost surely, 2^478674191 is an apocalyptic number.

478674191 is a deficient number, since it is larger than the sum of its proper divisors (1).

478674191 is an equidigital number, since it uses as much as digits as its factorization.

478674191 is an evil number, because the sum of its binary digits is even.

The product of its digits is 338688, while the sum is 47.

The square root of 478674191 is about 21878.6240655120. The cubic root of 478674191 is about 782.2519792236.

The spelling of 478674191 in words is "four hundred seventy-eight million, six hundred seventy-four thousand, one hundred ninety-one".