1243121 has 4 divisors (see below), whose sum is σ = 1356144. Its totient is φ = 1130100.

The previous prime is 1243111. The next prime is 1243129. The reversal of 1243121 is 1213421.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1213421 = 11 ⋅110311.

It is a cyclic number.

It is not a de Polignac number, because 1243121 - 2¹⁰ = 1242097 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1243096 and 1243105.

It is not an unprimeable number, because it can be changed into a prime (1243129) 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, 56495 + ... + 56516.

It is an arithmetic number, because the mean of its divisors is an integer number (339036).

2^1243121 is an apocalyptic number.

1243121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1243121 is a deficient number, since it is larger than the sum of its proper divisors (113023).

1243121 is a wasteful number, since it uses less digits than its factorization.

1243121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113022.

The product of its digits is 48, while the sum is 14.

The square root of 1243121 is about 1114.9533622533. The cubic root of 1243121 is about 107.5237661533.

Adding to 1243121 its reverse (1213421), we get a palindrome (2456542).

The spelling of 1243121 in words is "one million, two hundred forty-three thousand, one hundred twenty-one".