494159021 has 4 divisors (see below), whose sum is σ = 498692700. Its totient is φ = 489625344.

The previous prime is 494158991. The next prime is 494159027. The reversal of 494159021 is 120951494.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 327103396 + 167055625 = 18086^2 + 12925^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-494159021 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 (494159027) 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, 2266676 + ... + 2266893.

It is an arithmetic number, because the mean of its divisors is an integer number (124673175).

Almost surely, 2^494159021 is an apocalyptic number.

It is an amenable number.

494159021 is a deficient number, since it is larger than the sum of its proper divisors (4533679).

494159021 is a wasteful number, since it uses less digits than its factorization.

494159021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4533678.

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

The square root of 494159021 is about 22229.6878295670. The cubic root of 494159021 is about 790.5977535456.

The spelling of 494159021 in words is "four hundred ninety-four million, one hundred fifty-nine thousand, twenty-one".