494959821 has 4 divisors (see below), whose sum is σ = 659946432. Its totient is φ = 329973212.

The previous prime is 494959819. The next prime is 494959847. The reversal of 494959821 is 128959494.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 494959821 - 2¹ = 494959819 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (494959891) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 82493301 + ... + 82493306.

It is an arithmetic number, because the mean of its divisors is an integer number (164986608).

Almost surely, 2^494959821 is an apocalyptic number.

It is an amenable number.

494959821 is a deficient number, since it is larger than the sum of its proper divisors (164986611).

494959821 is a wasteful number, since it uses less digits than its factorization.

494959821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 164986610.

The product of its digits is 933120, while the sum is 51.

The square root of 494959821 is about 22247.6924870873. The cubic root of 494959821 is about 791.0245857797.

The spelling of 494959821 in words is "four hundred ninety-four million, nine hundred fifty-nine thousand, eight hundred twenty-one".