99980047 has 2 divisors, whose sum is σ = 99980048.
Its totient is φ = 99980046.
The previous prime is 99980003. The next prime is 99980063. The reversal of 99980047 is 74008999.
Subtracting from 99980047 its sum of digits (46), we obtain a square (99980001 = 99992).
99980047 is nontrivially palindromic in base 14.
It is a strong prime.
It is an emirp because it is prime and its reverse (74008999) is a distict prime.
It is a cyclic number.
It is a de Polignac number, because none of the positive numbers 2k-99980047 is a prime.
It is a junction number, because it is equal to n+sod(n) for n = 99979979 and 99980006.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (99980087) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49990023 + 49990024.
It is an arithmetic number, because the mean of its divisors is an integer number (49990024).
Almost surely, 299980047 is an apocalyptic number.
99980047 is a deficient number, since it is larger than the sum of its proper divisors (1).
99980047 is an equidigital number, since it uses as much as digits as its factorization.
99980047 is an evil number, because the sum of its binary digits is even.
The product of its (nonzero) digits is 163296, while the sum is 46.
The square root of 99980047 is about 9999.0023002298.
The cubic root of 99980047 is about 464.1280101005.
The spelling of 99980047 in words is "ninety-nine million, nine hundred eighty thousand, forty-seven".