491750643 has 4 divisors (see below), whose sum is σ = 655667528. Its totient is φ = 327833760.

The previous prime is 491750641. The next prime is 491750657. The reversal of 491750643 is 346057194.

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

It is not a de Polignac number, because 491750643 - 2¹ = 491750641 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (491750641) 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, 81958438 + ... + 81958443.

It is an arithmetic number, because the mean of its divisors is an integer number (163916882).

Almost surely, 2^491750643 is an apocalyptic number.

491750643 is a deficient number, since it is larger than the sum of its proper divisors (163916885).

491750643 is a wasteful number, since it uses less digits than its factorization.

491750643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163916884.

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

The square root of 491750643 is about 22175.4513595552. The cubic root of 491750643 is about 789.3112851407.

The spelling of 491750643 in words is "four hundred ninety-one million, seven hundred fifty thousand, six hundred forty-three".