1120991 has 4 divisors (see below), whose sum is σ = 1157184. Its totient is φ = 1084800.

The previous prime is 1120969. The next prime is 1120993. The reversal of 1120991 is 1990211.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1120991 is a prime.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1120993) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18050 + ... + 18111.

It is an arithmetic number, because the mean of its divisors is an integer number (289296).

2^1120991 is an apocalyptic number.

1120991 is a deficient number, since it is larger than the sum of its proper divisors (36193).

1120991 is an equidigital number, since it uses as much as digits as its factorization.

1120991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36192.

The product of its (nonzero) digits is 162, while the sum is 23.

The square root of 1120991 is about 1058.7686243935. The cubic root of 1120991 is about 103.8805025412.

The spelling of 1120991 in words is "one million, one hundred twenty thousand, nine hundred ninety-one".