47817857 has 2 divisors, whose sum is σ = 47817858. Its totient is φ = 47817856.

The previous prime is 47817827. The next prime is 47817859. The reversal of 47817857 is 75871874.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 36954241 + 10863616 = 6079^2 + 3296^2 .

It is a cyclic number.

It is not a de Polignac number, because 47817857 - 2⁶ = 47817793 is a prime.

Together with 47817859, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (47817859) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 23908928 + 23908929.

It is an arithmetic number, because the mean of its divisors is an integer number (23908929).

Almost surely, 2^47817857 is an apocalyptic number.

It is an amenable number.

47817857 is a deficient number, since it is larger than the sum of its proper divisors (1).

47817857 is an equidigital number, since it uses as much as digits as its factorization.

47817857 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 439040, while the sum is 47.

The square root of 47817857 is about 6915.0456976075. The cubic root of 47817857 is about 362.9638472800.

The spelling of 47817857 in words is "forty-seven million, eight hundred seventeen thousand, eight hundred fifty-seven".