1088991 has 16 divisors (see below), whose sum is σ = 1645920. Its totient is φ = 711360.

The previous prime is 1088987. The next prime is 1088993. The reversal of 1088991 is 1998801.

It is not a de Polignac number, because 1088991 - 2² = 1088987 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1088993) 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 in 15 ways as a sum of consecutive naturals, for example, 1051 + ... + 1811.

It is an arithmetic number, because the mean of its divisors is an integer number (102870).

2^1088991 is an apocalyptic number.

1088991 is a deficient number, since it is larger than the sum of its proper divisors (556929).

1088991 is an equidigital number, since it uses as much as digits as its factorization.

1088991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 823 (or 817 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 36.

The square root of 1088991 is about 1043.5473156498. The cubic root of 1088991 is about 102.8824813566.

It can be divided in two parts, 108899 and 1, that added together give a square (108900 = 330²).

The spelling of 1088991 in words is "one million, eighty-eight thousand, nine hundred ninety-one".