494691280921 has 4 divisors (see below), whose sum is σ = 523790768052. Its totient is φ = 465591793792.

The previous prime is 494691280891. The next prime is 494691281053. The reversal of 494691280921 is 129082196494.

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 358308790921 + 136382490000 = 598589^2 + 369300^2 .

It is a de Polignac number, because none of the positive numbers 2^k-494691280921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (494691290921) 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, 14549743540 + ... + 14549743573.

It is an arithmetic number, because the mean of its divisors is an integer number (130947692013).

Almost surely, 2^494691280921 is an apocalyptic number.

It is an amenable number.

494691280921 is a deficient number, since it is larger than the sum of its proper divisors (29099487131).

494691280921 is a wasteful number, since it uses less digits than its factorization.

494691280921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29099487130.

The product of its (nonzero) digits is 2239488, while the sum is 55.

The spelling of 494691280921 in words is "four hundred ninety-four billion, six hundred ninety-one million, two hundred eighty thousand, nine hundred twenty-one".