491653 has 2 divisors, whose sum is σ = 491654. Its totient is φ = 491652.

The previous prime is 491651. The next prime is 491669. The reversal of 491653 is 356194.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 263169 + 228484 = 513^2 + 478^2 .

It is a cyclic number.

It is not a de Polignac number, because 491653 - 2¹ = 491651 is a prime.

Together with 491651, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (491651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 245826 + 245827.

It is an arithmetic number, because the mean of its divisors is an integer number (245827).

2⁴⁹¹⁶⁵³ is an apocalyptic number.

It is an amenable number.

491653 is a deficient number, since it is larger than the sum of its proper divisors (1).

491653 is an equidigital number, since it uses as much as digits as its factorization.

491653 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3240, while the sum is 28.

The square root of 491653 is about 701.1797201859. The cubic root of 491653 is about 78.9259039269.

The spelling of 491653 in words is "four hundred ninety-one thousand, six hundred fifty-three".