9987001 has 2 divisors, whose sum is σ = 9987002.
Its totient is φ = 9987000.
The previous prime is 9986993. The next prime is 9987013. The reversal of 9987001 is 1007899.
9987001 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.
It is a weak prime.
It can be written as a sum of positive squares in only one way, i.e., 8294400 + 1692601 = 2880^2 + 1301^2
It is a cyclic number.
It is not a de Polignac number, because 9987001 - 23 = 9986993 is a prime.
It is equal to p663793 and since 9987001 and 663793 have the same sum of digits, it is a Honaker prime.
It is not a weakly prime, because it can be changed into another prime (9987031) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4993500 + 4993501.
It is an arithmetic number, because the mean of its divisors is an integer number (4993501).
Almost surely, 29987001 is an apocalyptic number.
It is an amenable number.
9987001 is a deficient number, since it is larger than the sum of its proper divisors (1).
9987001 is an equidigital number, since it uses as much as digits as its factorization.
9987001 is an evil number, because the sum of its binary digits is even.
The product of its (nonzero) digits is 4536, while the sum is 34.
The square root of 9987001 is about 3160.2216694403.
The cubic root of 9987001 is about 215.3500768696.
The spelling of 9987001 in words is "nine million, nine hundred eighty-seven thousand, one".