1123381 has 4 divisors (see below), whose sum is σ = 1283872. Its totient is φ = 962892.

The previous prime is 1123379. The next prime is 1123391. The reversal of 1123381 is 1833211.

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: 1833211 = 317 ⋅5783.

It is not a de Polignac number, because 1123381 - 2¹ = 1123379 is a prime.

It is a super-2 number, since 2×1123381² = 2523969742322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1123351) 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, 80235 + ... + 80248.

It is an arithmetic number, because the mean of its divisors is an integer number (320968).

2^1123381 is an apocalyptic number.

It is an amenable number.

1123381 is a deficient number, since it is larger than the sum of its proper divisors (160491).

1123381 is an equidigital number, since it uses as much as digits as its factorization.

1123381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160490.

The product of its digits is 144, while the sum is 19.

The square root of 1123381 is about 1059.8966930791. The cubic root of 1123381 is about 103.9542760048.

Adding to 1123381 its reverse (1833211), we get a palindrome (2956592).

The spelling of 1123381 in words is "one million, one hundred twenty-three thousand, three hundred eighty-one".