479778917 has 2 divisors, whose sum is σ = 479778918. Its totient is φ = 479778916.

The previous prime is 479778881. The next prime is 479778931. The reversal of 479778917 is 719877974.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 474978436 + 4800481 = 21794^2 + 2191^2 .

It is a cyclic number.

It is not a de Polignac number, because 479778917 - 2²⁰ = 478730341 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (479778967) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 239889458 + 239889459.

It is an arithmetic number, because the mean of its divisors is an integer number (239889459).

Almost surely, 2^479778917 is an apocalyptic number.

It is an amenable number.

479778917 is a deficient number, since it is larger than the sum of its proper divisors (1).

479778917 is an equidigital number, since it uses as much as digits as its factorization.

479778917 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6223392, while the sum is 59.

The square root of 479778917 is about 21903.8562130051. The cubic root of 479778917 is about 782.8532999562.

The spelling of 479778917 in words is "four hundred seventy-nine million, seven hundred seventy-eight thousand, nine hundred seventeen".