491287241 has 2 divisors, whose sum is σ = 491287242. Its totient is φ = 491287240.

The previous prime is 491287217. The next prime is 491287243. The reversal of 491287241 is 142782194.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 491287225 + 16 = 22165^2 + 4^2 .

It is a cyclic number.

It is not a de Polignac number, because 491287241 - 2⁶ = 491287177 is a prime.

Together with 491287243, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 491287195 and 491287204.

It is not a weakly prime, because it can be changed into another prime (491287243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 245643620 + 245643621.

It is an arithmetic number, because the mean of its divisors is an integer number (245643621).

Almost surely, 2^491287241 is an apocalyptic number.

It is an amenable number.

491287241 is a deficient number, since it is larger than the sum of its proper divisors (1).

491287241 is an equidigital number, since it uses as much as digits as its factorization.

491287241 is an evil number, because the sum of its binary digits is even.

The product of its digits is 32256, while the sum is 38.

The square root of 491287241 is about 22165.0003609294. Note that the first 3 decimals coincide. The cubic root of 491287241 is about 789.0632709709.

The spelling of 491287241 in words is "four hundred ninety-one million, two hundred eighty-seven thousand, two hundred forty-one".