494643549481 has 3 divisors (see below), whose sum is σ = 494644252791. Its totient is φ = 494642846172.

The previous prime is 494643549473. The next prime is 494643549503. The reversal of 494643549481 is 184945346494.

The square root of 494643549481 is 703309.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 477675881881 + 16967667600 = 691141^2 + 130260^2 .

It is not a de Polignac number, because 494643549481 - 2³ = 494643549473 is a prime.

It is a super-2 number, since 2×494643549481² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (494643549581) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 351655 + ... + 1054963.

It is an arithmetic number, because the mean of its divisors is an integer number (164881417597).

Almost surely, 2^494643549481 is an apocalyptic number.

494643549481 is the 703309-th square number.

494643549481 is the 351655-th centered octagonal number.

It is an amenable number.

494643549481 is a deficient number, since it is larger than the sum of its proper divisors (703310).

494643549481 is an frugal number, since it uses more digits than its factorization.

494643549481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1406618 (or 703309 counting only the distinct ones).

The product of its digits is 59719680, while the sum is 61.

The spelling of 494643549481 in words is "four hundred ninety-four billion, six hundred forty-three million, five hundred forty-nine thousand, four hundred eighty-one".