494625821 has 4 divisors (see below), whose sum is σ = 495395712. Its totient is φ = 493855932.

The previous prime is 494625809. The next prime is 494625823. The reversal of 494625821 is 128526494.

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 494625821 - 2¹⁰ = 494624797 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (494625823) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 383981 + ... + 385266.

It is an arithmetic number, because the mean of its divisors is an integer number (123848928).

Almost surely, 2^494625821 is an apocalyptic number.

It is an amenable number.

494625821 is a deficient number, since it is larger than the sum of its proper divisors (769891).

494625821 is an equidigital number, since it uses as much as digits as its factorization.

494625821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 769890.

The product of its digits is 138240, while the sum is 41.

The square root of 494625821 is about 22240.1848238723. The cubic root of 494625821 is about 790.8466173529.

The spelling of 494625821 in words is "four hundred ninety-four million, six hundred twenty-five thousand, eight hundred twenty-one".