491121793 has 4 divisors (see below), whose sum is σ = 491595520. Its totient is φ = 490648068.

The previous prime is 491121781. The next prime is 491121803. The reversal of 491121793 is 397121194.

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 a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-491121793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (491121703) 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, 235305 + ... + 237382.

It is an arithmetic number, because the mean of its divisors is an integer number (122898880).

Almost surely, 2^491121793 is an apocalyptic number.

It is an amenable number.

491121793 is a deficient number, since it is larger than the sum of its proper divisors (473727).

491121793 is a wasteful number, since it uses less digits than its factorization.

491121793 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 473726.

The product of its digits is 13608, while the sum is 37.

The square root of 491121793 is about 22161.2678563299. The cubic root of 491121793 is about 788.9746849146.

It can be divided in two parts, 49112 and 1793, that added together give a palindrome (50905).

The spelling of 491121793 in words is "four hundred ninety-one million, one hundred twenty-one thousand, seven hundred ninety-three".