478855891 has 2 divisors, whose sum is σ = 478855892. Its totient is φ = 478855890.

The previous prime is 478855843. The next prime is 478855903. The reversal of 478855891 is 198558874.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 478855891 - 2⁷ = 478855763 is a prime.

It is a super-3 number, since 3×478855891³ (a number of 27 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (478855831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 239427945 + 239427946.

It is an arithmetic number, because the mean of its divisors is an integer number (239427946).

Almost surely, 2^478855891 is an apocalyptic number.

478855891 is a deficient number, since it is larger than the sum of its proper divisors (1).

478855891 is an equidigital number, since it uses as much as digits as its factorization.

478855891 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3225600, while the sum is 55.

The square root of 478855891 is about 21882.7761264425. The cubic root of 478855891 is about 782.3509450802.

The spelling of 478855891 in words is "four hundred seventy-eight million, eight hundred fifty-five thousand, eight hundred ninety-one".