1811123 has 4 divisors (see below), whose sum is σ = 1841880. Its totient is φ = 1780368.

The previous prime is 1811119. The next prime is 1811141. The reversal of 1811123 is 3211181.

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 1811123 - 2² = 1811119 is a prime.

It is a super-2 number, since 2×1811123² = 6560333042258, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1811323) 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, 15290 + ... + 15407.

It is an arithmetic number, because the mean of its divisors is an integer number (460470).

2^1811123 is an apocalyptic number.

1811123 is a deficient number, since it is larger than the sum of its proper divisors (30757).

1811123 is an equidigital number, since it uses as much as digits as its factorization.

1811123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30756.

The product of its digits is 48, while the sum is 17.

The square root of 1811123 is about 1345.7796996537. The cubic root of 1811123 is about 121.8940897557.

The spelling of 1811123 in words is "one million, eight hundred eleven thousand, one hundred twenty-three".