478440581 has 2 divisors, whose sum is σ = 478440582. Its totient is φ = 478440580.

The previous prime is 478440563. The next prime is 478440583. The reversal of 478440581 is 185044874.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 477422500 + 1018081 = 21850^2 + 1009^2 .

It is a cyclic number.

It is not a de Polignac number, because 478440581 - 2⁶ = 478440517 is a prime.

It is a super-2 number, since 2×478440581² = 457810779095235122, which contains 22 as substring.

Together with 478440583, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (478440583) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 239220290 + 239220291.

It is an arithmetic number, because the mean of its divisors is an integer number (239220291).

Almost surely, 2^478440581 is an apocalyptic number.

It is an amenable number.

478440581 is a deficient number, since it is larger than the sum of its proper divisors (1).

478440581 is an equidigital number, since it uses as much as digits as its factorization.

478440581 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 143360, while the sum is 41.

The square root of 478440581 is about 21873.2846413153. The cubic root of 478440581 is about 782.1247029366.

The spelling of 478440581 in words is "four hundred seventy-eight million, four hundred forty thousand, five hundred eighty-one".