9987091 has 2 divisors, whose sum is σ = 9987092. Its totient is φ = 9987090.

The previous prime is 9987071. The next prime is 9987113. The reversal of 9987091 is 1907899.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 9987091 - 2¹⁵ = 9954323 is a prime.

9987091 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (9987001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4993545 + 4993546.

It is an arithmetic number, because the mean of its divisors is an integer number (4993546).

Almost surely, 2^9987091 is an apocalyptic number.

9987091 is a deficient number, since it is larger than the sum of its proper divisors (1).

9987091 is an equidigital number, since it uses as much as digits as its factorization.

9987091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 40824, while the sum is 43.

The square root of 9987091 is about 3160.2359089157. The cubic root of 9987091 is about 215.3507237587.

The spelling of 9987091 in words is "nine million, nine hundred eighty-seven thousand, ninety-one".