491672523 has 4 divisors (see below), whose sum is σ = 655563368. Its totient is φ = 327781680.

The previous prime is 491672501. The next prime is 491672527. The reversal of 491672523 is 325276194.

It is a semiprime because it is the product of two primes.

It is a de Polignac number, because none of the positive numbers 2^k-491672523 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (491672527) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 81945418 + ... + 81945423.

It is an arithmetic number, because the mean of its divisors is an integer number (163890842).

Almost surely, 2^491672523 is an apocalyptic number.

491672523 is a deficient number, since it is larger than the sum of its proper divisors (163890845).

491672523 is a wasteful number, since it uses less digits than its factorization.

491672523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163890844.

The product of its digits is 90720, while the sum is 39.

The square root of 491672523 is about 22173.6898823809. The cubic root of 491672523 is about 789.2694859999.

The spelling of 491672523 in words is "four hundred ninety-one million, six hundred seventy-two thousand, five hundred twenty-three".