495821 has 2 divisors, whose sum is σ = 495822. Its totient is φ = 495820.

The previous prime is 495799. The next prime is 495827. The reversal of 495821 is 128594.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 373321 + 122500 = 611^2 + 350^2 .

It is a cyclic number.

It is not a de Polignac number, because 495821 - 2⁶ = 495757 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 495821.

It is not a weakly prime, because it can be changed into another prime (495827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 247910 + 247911.

It is an arithmetic number, because the mean of its divisors is an integer number (247911).

2⁴⁹⁵⁸²¹ is an apocalyptic number.

It is an amenable number.

495821 is a deficient number, since it is larger than the sum of its proper divisors (1).

495821 is an equidigital number, since it uses as much as digits as its factorization.

495821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2880, while the sum is 29.

The square root of 495821 is about 704.1455815384. The cubic root of 495821 is about 79.1483087011.

The spelling of 495821 in words is "four hundred ninety-five thousand, eight hundred twenty-one".