1121813 has 16 divisors (see below), whose sum is σ = 1482624. Its totient is φ = 821760.

The previous prime is 1121737. The next prime is 1121819. The reversal of 1121813 is 3181211.

It is a cyclic number.

It is not a de Polignac number, because 1121813 - 2⁸ = 1121557 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 1121791 and 1121800.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1121819) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 881 + ... + 1737.

It is an arithmetic number, because the mean of its divisors is an integer number (92664).

2^1121813 is an apocalyptic number.

It is an amenable number.

1121813 is a deficient number, since it is larger than the sum of its proper divisors (360811).

1121813 is a wasteful number, since it uses less digits than its factorization.

1121813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 892.

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

The square root of 1121813 is about 1059.1567400531. The cubic root of 1121813 is about 103.9058874938.

The spelling of 1121813 in words is "one million, one hundred twenty-one thousand, eight hundred thirteen".