491572383 has 4 divisors (see below), whose sum is σ = 655429848. Its totient is φ = 327714920.

The previous prime is 491572379. The next prime is 491572421. The reversal of 491572383 is 383275194.

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

It is a cyclic number.

It is not a de Polignac number, because 491572383 - 2² = 491572379 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491572183) 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, 81928728 + ... + 81928733.

It is an arithmetic number, because the mean of its divisors is an integer number (163857462).

Almost surely, 2^491572383 is an apocalyptic number.

491572383 is a deficient number, since it is larger than the sum of its proper divisors (163857465).

491572383 is a wasteful number, since it uses less digits than its factorization.

491572383 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163857464.

The product of its digits is 181440, while the sum is 42.

The square root of 491572383 is about 22171.4316858429. The cubic root of 491572383 is about 789.2158982905.

The spelling of 491572383 in words is "four hundred ninety-one million, five hundred seventy-two thousand, three hundred eighty-three".