1086991 has 2 divisors, whose sum is σ = 1086992. Its totient is φ = 1086990.

The previous prime is 1086989. The next prime is 1087001. The reversal of 1086991 is 1996801.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1086991 - 2¹ = 1086989 is a prime.

Together with 1086989, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1086901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 543495 + 543496.

It is an arithmetic number, because the mean of its divisors is an integer number (543496).

2^1086991 is an apocalyptic number.

1086991 is a deficient number, since it is larger than the sum of its proper divisors (1).

1086991 is an equidigital number, since it uses as much as digits as its factorization.

1086991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3888, while the sum is 34.

The square root of 1086991 is about 1042.5886053473. The cubic root of 1086991 is about 102.8194593916.

The spelling of 1086991 in words is "one million, eighty-six thousand, nine hundred ninety-one".