491940541 has 4 divisors (see below), whose sum is σ = 501222492. Its totient is φ = 482658592.

The previous prime is 491940529. The next prime is 491940569. The reversal of 491940541 is 145049194.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 145049194 = 2 ⋅72524597.

It can be written as a sum of positive squares in 2 ways, for example, as 181440900 + 310499641 = 13470^2 + 17621^2 .

It is a cyclic number.

It is not a de Polignac number, because 491940541 - 2¹¹ = 491938493 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 491940541.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491940521) 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, 4640896 + ... + 4641001.

It is an arithmetic number, because the mean of its divisors is an integer number (125305623).

Almost surely, 2^491940541 is an apocalyptic number.

It is an amenable number.

491940541 is a deficient number, since it is larger than the sum of its proper divisors (9281951).

491940541 is an equidigital number, since it uses as much as digits as its factorization.

491940541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9281950.

The product of its (nonzero) digits is 25920, while the sum is 37.

The square root of 491940541 is about 22179.7326629516. The cubic root of 491940541 is about 789.4128741247.

The spelling of 491940541 in words is "four hundred ninety-one million, nine hundred forty thousand, five hundred forty-one".