491601723 has 8 divisors (see below), whose sum is σ = 662226768. Its totient is φ = 324355584.

The previous prime is 491601709. The next prime is 491601731. The reversal of 491601723 is 327106194.

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

It is not a de Polignac number, because 491601723 - 2²¹ = 489504571 is a prime.

It is not an unprimeable number, because it can be changed into a prime (491601703) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 844386 + ... + 844967.

It is an arithmetic number, because the mean of its divisors is an integer number (82778346).

Almost surely, 2^491601723 is an apocalyptic number.

491601723 is a deficient number, since it is larger than the sum of its proper divisors (170625045).

491601723 is a wasteful number, since it uses less digits than its factorization.

491601723 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1689453.

The product of its (nonzero) digits is 9072, while the sum is 33.

The square root of 491601723 is about 22172.0933382484. The cubic root of 491601723 is about 789.2315996973.

The spelling of 491601723 in words is "four hundred ninety-one million, six hundred one thousand, seven hundred twenty-three".