47817913987 has 2 divisors, whose sum is σ = 47817913988. Its totient is φ = 47817913986.

The previous prime is 47817913981. The next prime is 47817913999. The reversal of 47817913987 is 78931971874.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 47817913987 - 2¹⁵ = 47817881219 is a prime.

It is not a weakly prime, because it can be changed into another prime (47817913981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 23908956993 + 23908956994.

It is an arithmetic number, because the mean of its divisors is an integer number (23908956994).

Almost surely, 2^47817913987 is an apocalyptic number.

47817913987 is a deficient number, since it is larger than the sum of its proper divisors (1).

47817913987 is an equidigital number, since it uses as much as digits as its factorization.

47817913987 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 21337344, while the sum is 64.

The spelling of 47817913987 in words is "forty-seven billion, eight hundred seventeen million, nine hundred thirteen thousand, nine hundred eighty-seven".