1111891 has 4 divisors (see below), whose sum is σ = 1212984. Its totient is φ = 1010800.

The previous prime is 1111867. The next prime is 1111897. The reversal of 1111891 is 1981111.

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 1111891 - 2⁹ = 1111379 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1111897) 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, 50530 + ... + 50551.

It is an arithmetic number, because the mean of its divisors is an integer number (303246).

2^1111891 is an apocalyptic number.

1111891 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1111891 is a deficient number, since it is larger than the sum of its proper divisors (101093).

1111891 is a wasteful number, since it uses less digits than its factorization.

1111891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101092.

The product of its digits is 72, while the sum is 22.

The square root of 1111891 is about 1054.4624222797. The cubic root of 1111891 is about 103.5986441587.

It can be divided in two parts, 1111 and 891, that added together give a palindrome (2002).

The spelling of 1111891 in words is "one million, one hundred eleven thousand, eight hundred ninety-one".