478253981 has 2 divisors, whose sum is σ = 478253982. Its totient is φ = 478253980.

The previous prime is 478253977. The next prime is 478254011. The reversal of 478253981 is 189352874.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 291248356 + 187005625 = 17066^2 + 13675^2 .

It is a cyclic number.

It is not a de Polignac number, because 478253981 - 2² = 478253977 is a prime.

It is a super-2 number, since 2×478253981² = 457453740684696722, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (478253081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 239126990 + 239126991.

It is an arithmetic number, because the mean of its divisors is an integer number (239126991).

Almost surely, 2^478253981 is an apocalyptic number.

It is an amenable number.

478253981 is a deficient number, since it is larger than the sum of its proper divisors (1).

478253981 is an equidigital number, since it uses as much as digits as its factorization.

478253981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 483840, while the sum is 47.

The square root of 478253981 is about 21869.0187479914. The cubic root of 478253981 is about 782.0230090495.

The spelling of 478253981 in words is "four hundred seventy-eight million, two hundred fifty-three thousand, nine hundred eighty-one".