521923 has 2 divisors, whose sum is σ = 521924. Its totient is φ = 521922.

The previous prime is 521903. The next prime is 521929. The reversal of 521923 is 329125.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 521923 - 2¹³ = 513731 is a prime.

It is a zygodrome in base 3.

It is a junction number, because it is equal to n+sod(n) for n = 521894 and 521903.

It is not a weakly prime, because it can be changed into another prime (521929) 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, 260961 + 260962.

It is an arithmetic number, because the mean of its divisors is an integer number (260962).

2⁵²¹⁹²³ is an apocalyptic number.

521923 is a deficient number, since it is larger than the sum of its proper divisors (1).

521923 is an equidigital number, since it uses as much as digits as its factorization.

521923 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 540, while the sum is 22.

The square root of 521923 is about 722.4423852460. The cubic root of 521923 is about 80.5135195842.

It can be divided in two parts, 521 and 923, that added together give a square (1444 = 38²).

The spelling of 521923 in words is "five hundred twenty-one thousand, nine hundred twenty-three".