491873 has 2 divisors, whose sum is σ = 491874. Its totient is φ = 491872.

The previous prime is 491867. The next prime is 491899. The reversal of 491873 is 378194.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 283024 + 208849 = 532^2 + 457^2 .

It is a cyclic number.

It is not a de Polignac number, because 491873 - 2⁴ = 491857 is a prime.

It is not a weakly prime, because it can be changed into another prime (491833) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 245936 + 245937.

It is an arithmetic number, because the mean of its divisors is an integer number (245937).

2⁴⁹¹⁸⁷³ is an apocalyptic number.

It is an amenable number.

491873 is a deficient number, since it is larger than the sum of its proper divisors (1).

491873 is an equidigital number, since it uses as much as digits as its factorization.

491873 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 491873 is about 701.3365811078. The cubic root of 491873 is about 78.9376744978.

The spelling of 491873 in words is "four hundred ninety-one thousand, eight hundred seventy-three".