478131917 has 2 divisors, whose sum is σ = 478131918. Its totient is φ = 478131916.

The previous prime is 478131887. The next prime is 478131947. The reversal of 478131917 is 719131874.

It is a balanced prime because it is at equal distance from previous prime (478131887) and next prime (478131947).

It can be written as a sum of positive squares in only one way, i.e., 444619396 + 33512521 = 21086^2 + 5789^2 .

It is a cyclic number.

It is not a de Polignac number, because 478131917 - 2⁶ = 478131853 is a prime.

It is a super-2 number, since 2×478131917² = 457220260108189778, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (478131947) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 239065958 + 239065959.

It is an arithmetic number, because the mean of its divisors is an integer number (239065959).

Almost surely, 2^478131917 is an apocalyptic number.

It is an amenable number.

478131917 is a deficient number, since it is larger than the sum of its proper divisors (1).

478131917 is an equidigital number, since it uses as much as digits as its factorization.

478131917 is an evil number, because the sum of its binary digits is even.

The product of its digits is 42336, while the sum is 41.

The square root of 478131917 is about 21866.2277725263. The cubic root of 478131917 is about 781.9564718938.

The spelling of 478131917 in words is "four hundred seventy-eight million, one hundred thirty-one thousand, nine hundred seventeen".