491783 has 2 divisors, whose sum is σ = 491784. Its totient is φ = 491782.

The previous prime is 491773. The next prime is 491789. The reversal of 491783 is 387194.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 491783 - 2⁶ = 491719 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (491789) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 245891 + 245892.

It is an arithmetic number, because the mean of its divisors is an integer number (245892).

2⁴⁹¹⁷⁸³ is an apocalyptic number.

491783 is a deficient number, since it is larger than the sum of its proper divisors (1).

491783 is an equidigital number, since it uses as much as digits as its factorization.

491783 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6048, while the sum is 32.

The square root of 491783 is about 701.2724149715. The cubic root of 491783 is about 78.9328596886.

The spelling of 491783 in words is "four hundred ninety-one thousand, seven hundred eighty-three".