47978017 has 2 divisors, whose sum is σ = 47978018. Its totient is φ = 47978016.

The previous prime is 47978003. The next prime is 47978057. The reversal of 47978017 is 71087974.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 47210641 + 767376 = 6871^2 + 876^2 .

It is a cyclic number.

It is not a de Polignac number, because 47978017 - 2⁷ = 47977889 is a prime.

It is not a weakly prime, because it can be changed into another prime (47978057) 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, 23989008 + 23989009.

It is an arithmetic number, because the mean of its divisors is an integer number (23989009).

Almost surely, 2^47978017 is an apocalyptic number.

It is an amenable number.

47978017 is a deficient number, since it is larger than the sum of its proper divisors (1).

47978017 is an equidigital number, since it uses as much as digits as its factorization.

47978017 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 98784, while the sum is 43.

The square root of 47978017 is about 6926.6165622185. The cubic root of 47978017 is about 363.3686298697.

Subtracting from 47978017 its sum of digits (43), we obtain a palindrome (47977974).

The spelling of 47978017 in words is "forty-seven million, nine hundred seventy-eight thousand, seventeen".