478538861 has 2 divisors, whose sum is σ = 478538862. Its totient is φ = 478538860.

The previous prime is 478538833. The next prime is 478538891. The reversal of 478538861 is 168835874.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 444956836 + 33582025 = 21094^2 + 5795^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-478538861 is a prime.

It is a congruent number.

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, 239269430 + 239269431.

It is an arithmetic number, because the mean of its divisors is an integer number (239269431).

Almost surely, 2^478538861 is an apocalyptic number.

It is an amenable number.

478538861 is a deficient number, since it is larger than the sum of its proper divisors (1).

478538861 is an equidigital number, since it uses as much as digits as its factorization.

478538861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1290240, while the sum is 50.

The square root of 478538861 is about 21875.5311021241. The cubic root of 478538861 is about 782.1782532667.

The spelling of 478538861 in words is "four hundred seventy-eight million, five hundred thirty-eight thousand, eight hundred sixty-one".