1095991 has 4 divisors (see below), whose sum is σ = 1180312. Its totient is φ = 1011672.

The previous prime is 1095989. The next prime is 1096031. The reversal of 1095991 is 1995901.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1095991 - 2¹ = 1095989 is a prime.

It is a Duffinian number.

1095991 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1095931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42141 + ... + 42166.

It is an arithmetic number, because the mean of its divisors is an integer number (295078).

2^1095991 is an apocalyptic number.

1095991 is a deficient number, since it is larger than the sum of its proper divisors (84321).

1095991 is an equidigital number, since it uses as much as digits as its factorization.

1095991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84320.

The product of its (nonzero) digits is 3645, while the sum is 34.

The square root of 1095991 is about 1046.8958878513. The cubic root of 1095991 is about 103.1024524932.

The spelling of 1095991 in words is "one million, ninety-five thousand, nine hundred ninety-one".