817123 has 2 divisors, whose sum is σ = 817124. Its totient is φ = 817122.

The previous prime is 817111. The next prime is 817127. The reversal of 817123 is 321718.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 817123 - 2¹⁷ = 686051 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 817094 and 817103.

It is not a weakly prime, because it can be changed into another prime (817127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 408561 + 408562.

It is an arithmetic number, because the mean of its divisors is an integer number (408562).

2⁸¹⁷¹²³ is an apocalyptic number.

817123 is a deficient number, since it is larger than the sum of its proper divisors (1).

817123 is an equidigital number, since it uses as much as digits as its factorization.

817123 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 336, while the sum is 22.

The square root of 817123 is about 903.9485604834. The cubic root of 817123 is about 93.4894227695.

The spelling of 817123 in words is "eight hundred seventeen thousand, one hundred twenty-three".