491463993 has 4 divisors (see below), whose sum is σ = 655285328. Its totient is φ = 327642660.

The previous prime is 491463991. The next prime is 491464009. The reversal of 491463993 is 399364194.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 491463993 - 2¹ = 491463991 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (491463991) 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, 81910663 + ... + 81910668.

It is an arithmetic number, because the mean of its divisors is an integer number (163821332).

Almost surely, 2^491463993 is an apocalyptic number.

It is an amenable number.

491463993 is a deficient number, since it is larger than the sum of its proper divisors (163821335).

491463993 is a wasteful number, since it uses less digits than its factorization.

491463993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163821334.

The product of its digits is 629856, while the sum is 48.

The square root of 491463993 is about 22168.9871893147. The cubic root of 491463993 is about 789.1578875735.

The spelling of 491463993 in words is "four hundred ninety-one million, four hundred sixty-three thousand, nine hundred ninety-three".