478538891 has 2 divisors, whose sum is σ = 478538892. Its totient is φ = 478538890.

The previous prime is 478538861. The next prime is 478538903. The reversal of 478538891 is 198835874.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 478538891 - 2¹⁴ = 478522507 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (478538821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 239269445 + 239269446.

It is an arithmetic number, because the mean of its divisors is an integer number (239269446).

Almost surely, 2^478538891 is an apocalyptic number.

478538891 is a deficient number, since it is larger than the sum of its proper divisors (1).

478538891 is an equidigital number, since it uses as much as digits as its factorization.

478538891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1935360, while the sum is 53.

The square root of 478538891 is about 21875.5317878218. The cubic root of 478538891 is about 782.1782696118.

The spelling of 478538891 in words is "four hundred seventy-eight million, five hundred thirty-eight thousand, eight hundred ninety-one".