491641 has 4 divisors (see below), whose sum is σ = 493812. Its totient is φ = 489472.

The previous prime is 491639. The next prime is 491651. The reversal of 491641 is 146194.

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

It can be written as a sum of positive squares in 2 ways, for example, as 462400 + 29241 = 680^2 + 171^2 .

It is a cyclic number.

It is not a de Polignac number, because 491641 - 2¹ = 491639 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (491611) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 700 + ... + 1213.

It is an arithmetic number, because the mean of its divisors is an integer number (123453).

2⁴⁹¹⁶⁴¹ is an apocalyptic number.

It is an amenable number.

491641 is a deficient number, since it is larger than the sum of its proper divisors (2171).

491641 is a wasteful number, since it uses less digits than its factorization.

491641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2170.

The product of its digits is 864, while the sum is 25.

The square root of 491641 is about 701.1711631264. The cubic root of 491641 is about 78.9252617947.

The spelling of 491641 in words is "four hundred ninety-one thousand, six hundred forty-one".