1123121 has 4 divisors (see below), whose sum is σ = 1139952. Its totient is φ = 1106292.

The previous prime is 1123093. The next prime is 1123127. The reversal of 1123121 is 1213211.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1123121 is a prime.

It is a super-2 number, since 2×1123121² = 2522801561282, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1123127) 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, 8315 + ... + 8448.

It is an arithmetic number, because the mean of its divisors is an integer number (284988).

2^1123121 is an apocalyptic number.

It is an amenable number.

1123121 is a deficient number, since it is larger than the sum of its proper divisors (16831).

1123121 is an equidigital number, since it uses as much as digits as its factorization.

1123121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16830.

The product of its digits is 12, while the sum is 11.

The square root of 1123121 is about 1059.7740325183. The cubic root of 1123121 is about 103.9462555151.

Adding to 1123121 its reverse (1213211), we get a palindrome (2336332).

It can be divided in two parts, 11 and 23121, that added together give a palindrome (23132).

The spelling of 1123121 in words is "one million, one hundred twenty-three thousand, one hundred twenty-one".