491742789 has 8 divisors (see below), whose sum is σ = 661785120. Its totient is φ = 324764496.

The previous prime is 491742787. The next prime is 491742793. The reversal of 491742789 is 987247194.

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

It is not a de Polignac number, because 491742789 - 2¹ = 491742787 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491742787) 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, 765634 + ... + 766275.

It is an arithmetic number, because the mean of its divisors is an integer number (82723140).

Almost surely, 2^491742789 is an apocalyptic number.

It is an amenable number.

491742789 is a deficient number, since it is larger than the sum of its proper divisors (170042331).

491742789 is a wasteful number, since it uses less digits than its factorization.

491742789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1532019.

The product of its digits is 1016064, while the sum is 51.

The square root of 491742789 is about 22175.2742711336. The cubic root of 491742789 is about 789.3070829541.

The spelling of 491742789 in words is "four hundred ninety-one million, seven hundred forty-two thousand, seven hundred eighty-nine".