491193663 has 8 divisors (see below), whose sum is σ = 668859648. Its totient is φ = 320495064.

The previous prime is 491193649. The next prime is 491193673. The reversal of 491193663 is 366391194.

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

It is not a de Polignac number, because 491193663 - 2⁹ = 491193151 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491193623) 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, 1741681 + ... + 1741962.

It is an arithmetic number, because the mean of its divisors is an integer number (83607456).

Almost surely, 2^491193663 is an apocalyptic number.

491193663 is a deficient number, since it is larger than the sum of its proper divisors (177665985).

491193663 is a wasteful number, since it uses less digits than its factorization.

491193663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3483693.

The product of its digits is 104976, while the sum is 42.

The square root of 491193663 is about 22162.8893197615. The cubic root of 491193663 is about 789.0131688139.

The spelling of 491193663 in words is "four hundred ninety-one million, one hundred ninety-three thousand, six hundred sixty-three".