905123 has 2 divisors, whose sum is σ = 905124. Its totient is φ = 905122.

The previous prime is 905111. The next prime is 905137. The reversal of 905123 is 321509.

It is a weak prime.

It is an emirp because it is prime and its reverse (321509) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 905123 - 2⁶ = 905059 is a prime.

It is a Sophie Germain prime.

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 905095 and 905104.

It is not a weakly prime, because it can be changed into another prime (905143) 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, 452561 + 452562.

It is an arithmetic number, because the mean of its divisors is an integer number (452562).

2⁹⁰⁵¹²³ is an apocalyptic number.

905123 is a deficient number, since it is larger than the sum of its proper divisors (1).

905123 is an equidigital number, since it uses as much as digits as its factorization.

905123 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 270, while the sum is 20.

The square root of 905123 is about 951.3795246903. The cubic root of 905123 is about 96.7317846355.

The spelling of 905123 in words is "nine hundred five thousand, one hundred twenty-three".