1123391 has 2 divisors, whose sum is σ = 1123392. Its totient is φ = 1123390.

The previous prime is 1123379. The next prime is 1123399. The reversal of 1123391 is 1933211.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1123391 - 2⁶ = 1123327 is a prime.

It is a Chen prime.

It is equal to p₈₇₄₀₁ and since 1123391 and 87401 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1123399) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 561695 + 561696.

It is an arithmetic number, because the mean of its divisors is an integer number (561696).

2^1123391 is an apocalyptic number.

1123391 is a deficient number, since it is larger than the sum of its proper divisors (1).

1123391 is an equidigital number, since it uses as much as digits as its factorization.

1123391 is an evil number, because the sum of its binary digits is even.

The product of its digits is 162, while the sum is 20.

The square root of 1123391 is about 1059.9014105095. The cubic root of 1123391 is about 103.9545844604.

The spelling of 1123391 in words is "one million, one hundred twenty-three thousand, three hundred ninety-one".