491221351563 has 8 divisors (see below), whose sum is σ = 654971398800. Its totient is φ = 327476102688.

The previous prime is 491221351553. The next prime is 491221351589. The reversal of 491221351563 is 365153122194.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 491221351563 - 2⁹ = 491221351051 is a prime.

It is not an unprimeable number, because it can be changed into a prime (491221351553) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 953508 + ... + 1375361.

It is an arithmetic number, because the mean of its divisors is an integer number (81871424850).

Almost surely, 2^491221351563 is an apocalyptic number.

491221351563 is a deficient number, since it is larger than the sum of its proper divisors (163750047237).

491221351563 is a wasteful number, since it uses less digits than its factorization.

491221351563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2399181.

The product of its digits is 194400, while the sum is 42.

The spelling of 491221351563 in words is "four hundred ninety-one billion, two hundred twenty-one million, three hundred fifty-one thousand, five hundred sixty-three".