504989 has 2 divisors, whose sum is σ = 504990. Its totient is φ = 504988.

The previous prime is 504983. The next prime is 504991. The reversal of 504989 is 989405.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 284089 + 220900 = 533^2 + 470^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-504989 is a prime.

Together with 504991, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (504983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 252494 + 252495.

It is an arithmetic number, because the mean of its divisors is an integer number (252495).

2⁵⁰⁴⁹⁸⁹ is an apocalyptic number.

It is an amenable number.

504989 is a deficient number, since it is larger than the sum of its proper divisors (1).

504989 is an equidigital number, since it uses as much as digits as its factorization.

504989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12960, while the sum is 35.

The square root of 504989 is about 710.6257805625. The cubic root of 504989 is about 79.6331642149.

Subtracting 504989 from its reverse (989405), we obtain a square (484416 = 696²).

The spelling of 504989 in words is "five hundred four thousand, nine hundred eighty-nine".