9991027 has 2 divisors, whose sum is σ = 9991028. Its totient is φ = 9991026.

The previous prime is 9990997. The next prime is 9991057. The reversal of 9991027 is 7201999.

It is a balanced prime because it is at equal distance from previous prime (9990997) and next prime (9991057).

It is a cyclic number.

It is not a de Polignac number, because 9991027 - 2⁷ = 9990899 is a prime.

It is not a weakly prime, because it can be changed into another prime (9991057) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4995513 + 4995514.

It is an arithmetic number, because the mean of its divisors is an integer number (4995514).

Almost surely, 2^9991027 is an apocalyptic number.

9991027 is a deficient number, since it is larger than the sum of its proper divisors (1).

9991027 is an equidigital number, since it uses as much as digits as its factorization.

9991027 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10206, while the sum is 37.

The square root of 9991027 is about 3160.8585858909. The cubic root of 9991027 is about 215.3790105782.

The spelling of 9991027 in words is "nine million, nine hundred ninety-one thousand, twenty-seven".