1831121 has 4 divisors (see below), whose sum is σ = 1938852. Its totient is φ = 1723392.

The previous prime is 1831111. The next prime is 1831127. The reversal of 1831121 is 1211381.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1638400 + 192721 = 1280^2 + 439^2 .

It is not a de Polignac number, because 1831121 - 2¹⁴ = 1814737 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17), and also a Moran number because the ratio is a prime number: 107713 = 1831121 / (1 + 8 + 3 + 1 + 1 + 2 + 1).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1831121.

It is not an unprimeable number, because it can be changed into a prime (1831127) 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, 53840 + ... + 53873.

It is an arithmetic number, because the mean of its divisors is an integer number (484713).

2^1831121 is an apocalyptic number.

It is an amenable number.

1831121 is a deficient number, since it is larger than the sum of its proper divisors (107731).

1831121 is a wasteful number, since it uses less digits than its factorization.

1831121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107730.

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

The square root of 1831121 is about 1353.1891959368. The cubic root of 1831121 is about 122.3410906308.

The spelling of 1831121 in words is "one million, eight hundred thirty-one thousand, one hundred twenty-one".