478172281 has 2 divisors, whose sum is σ = 478172282. Its totient is φ = 478172280.

The previous prime is 478172273. The next prime is 478172287. The reversal of 478172281 is 182271874.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 477204025 + 968256 = 21845^2 + 984^2 .

It is a cyclic number.

It is not a de Polignac number, because 478172281 - 2³ = 478172273 is a prime.

It is a super-2 number, since 2×478172281² = 457297460633485922, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (478172287) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 239086140 + 239086141.

It is an arithmetic number, because the mean of its divisors is an integer number (239086141).

Almost surely, 2^478172281 is an apocalyptic number.

It is an amenable number.

478172281 is a deficient number, since it is larger than the sum of its proper divisors (1).

478172281 is an equidigital number, since it uses as much as digits as its factorization.

478172281 is an evil number, because the sum of its binary digits is even.

The product of its digits is 50176, while the sum is 40.

The square root of 478172281 is about 21867.1507288901. The cubic root of 478172281 is about 781.9784755862.

The spelling of 478172281 in words is "four hundred seventy-eight million, one hundred seventy-two thousand, two hundred eighty-one".