478778137 has 2 divisors, whose sum is σ = 478778138. Its totient is φ = 478778136.

The previous prime is 478778117. The next prime is 478778141. The reversal of 478778137 is 731877874.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 243953161 + 234824976 = 15619^2 + 15324^2 .

It is a cyclic number.

It is not a de Polignac number, because 478778137 - 2²⁷ = 344560409 is a prime.

It is not a weakly prime, because it can be changed into another prime (478778117) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 239389068 + 239389069.

It is an arithmetic number, because the mean of its divisors is an integer number (239389069).

Almost surely, 2^478778137 is an apocalyptic number.

It is an amenable number.

478778137 is a deficient number, since it is larger than the sum of its proper divisors (1).

478778137 is an equidigital number, since it uses as much as digits as its factorization.

478778137 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1843968, while the sum is 52.

The square root of 478778137 is about 21880.9994515790. Note that the first 3 decimals coincide. The cubic root of 478778137 is about 782.3085981659.

The spelling of 478778137 in words is "four hundred seventy-eight million, seven hundred seventy-eight thousand, one hundred thirty-seven".