491728841 has 2 divisors, whose sum is σ = 491728842. Its totient is φ = 491728840.

The previous prime is 491728837. The next prime is 491728871. The reversal of 491728841 is 148827194.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 283215241 + 208513600 = 16829^2 + 14440^2 .

It is a cyclic number.

It is not a de Polignac number, because 491728841 - 2² = 491728837 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 491728792 and 491728801.

It is not a weakly prime, because it can be changed into another prime (491728871) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 245864420 + 245864421.

It is an arithmetic number, because the mean of its divisors is an integer number (245864421).

Almost surely, 2^491728841 is an apocalyptic number.

It is an amenable number.

491728841 is a deficient number, since it is larger than the sum of its proper divisors (1).

491728841 is an equidigital number, since it uses as much as digits as its factorization.

491728841 is an evil number, because the sum of its binary digits is even.

The product of its digits is 129024, while the sum is 44.

The square root of 491728841 is about 22174.9597744844. The cubic root of 491728841 is about 789.2996201372.

The spelling of 491728841 in words is "four hundred ninety-one million, seven hundred twenty-eight thousand, eight hundred forty-one".