9001987 has 2 divisors, whose sum is σ = 9001988. Its totient is φ = 9001986.

The previous prime is 9001969. The next prime is 9001999. The reversal of 9001987 is 7891009.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9001987 is a prime.

It is not a weakly prime, because it can be changed into another prime (9001387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4500993 + 4500994.

It is an arithmetic number, because the mean of its divisors is an integer number (4500994).

Almost surely, 2^9001987 is an apocalyptic number.

9001987 is a deficient number, since it is larger than the sum of its proper divisors (1).

9001987 is an equidigital number, since it uses as much as digits as its factorization.

9001987 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4536, while the sum is 34.

The square root of 9001987 is about 3000.3311483901. The cubic root of 9001987 is about 208.0236890549.

The spelling of 9001987 in words is "nine million, one thousand, nine hundred eighty-seven".