811123 has 2 divisors, whose sum is σ = 811124. Its totient is φ = 811122.

The previous prime is 811099. The next prime is 811127. The reversal of 811123 is 321118.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-811123 is a prime.

It is a super-2 number, since 2×811123² = 1315841042258, which contains 22 as substring.

It is a zygodrome in base 2.

It is a junction number, because it is equal to n+sod(n) for n = 811097 and 811106.

It is not a weakly prime, because it can be changed into another prime (811127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 405561 + 405562.

It is an arithmetic number, because the mean of its divisors is an integer number (405562).

2⁸¹¹¹²³ is an apocalyptic number.

811123 is a deficient number, since it is larger than the sum of its proper divisors (1).

811123 is an equidigital number, since it uses as much as digits as its factorization.

811123 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 48, while the sum is 16.

The square root of 811123 is about 900.6236727957. The cubic root of 811123 is about 93.2600345705.

The spelling of 811123 in words is "eight hundred eleven thousand, one hundred twenty-three".