495066821 has 2 divisors, whose sum is σ = 495066822. Its totient is φ = 495066820.

The previous prime is 495066811. The next prime is 495066829. The reversal of 495066821 is 128660594.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 472845025 + 22221796 = 21745^2 + 4714^2 .

It is a cyclic number.

It is not a de Polignac number, because 495066821 - 2¹⁰ = 495065797 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (495066829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 247533410 + 247533411.

It is an arithmetic number, because the mean of its divisors is an integer number (247533411).

Almost surely, 2^495066821 is an apocalyptic number.

It is an amenable number.

495066821 is a deficient number, since it is larger than the sum of its proper divisors (1).

495066821 is an equidigital number, since it uses as much as digits as its factorization.

495066821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 103680, while the sum is 41.

The square root of 495066821 is about 22250.0971009117. The cubic root of 495066821 is about 791.0815826837.

The spelling of 495066821 in words is "four hundred ninety-five million, sixty-six thousand, eight hundred twenty-one".