491447731 has 8 divisors (see below), whose sum is σ = 508939200. Its totient is φ = 474231912.

The previous prime is 491447707. The next prime is 491447741. The reversal of 491447731 is 137744194.

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

It is a cyclic number.

It is not a de Polignac number, because 491447731 - 2⁵ = 491447699 is a prime.

It is a super-2 number, since 2×491447731² = 483041744610096722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (491447701) 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 7 ways as a sum of consecutive naturals, for example, 65281 + ... + 72418.

It is an arithmetic number, because the mean of its divisors is an integer number (63617400).

Almost surely, 2^491447731 is an apocalyptic number.

491447731 is a deficient number, since it is larger than the sum of its proper divisors (17491469).

491447731 is a wasteful number, since it uses less digits than its factorization.

491447731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137825.

The product of its digits is 84672, while the sum is 40.

The square root of 491447731 is about 22168.6204126463. The cubic root of 491447731 is about 789.1491833569.

The spelling of 491447731 in words is "four hundred ninety-one million, four hundred forty-seven thousand, seven hundred thirty-one".