490617781 has 2 divisors, whose sum is σ = 490617782. Its totient is φ = 490617780.

The previous prime is 490617769. The next prime is 490617839. The reversal of 490617781 is 187716094.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 260822500 + 229795281 = 16150^2 + 15159^2 .

It is a cyclic number.

It is not a de Polignac number, because 490617781 - 2⁷ = 490617653 is a prime.

It is a super-2 number, since 2×490617781² = 481411614066727922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (490617481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 245308890 + 245308891.

It is an arithmetic number, because the mean of its divisors is an integer number (245308891).

Almost surely, 2^490617781 is an apocalyptic number.

It is an amenable number.

490617781 is a deficient number, since it is larger than the sum of its proper divisors (1).

490617781 is an equidigital number, since it uses as much as digits as its factorization.

490617781 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 84672, while the sum is 43.

The square root of 490617781 is about 22149.8934760418. The cubic root of 490617781 is about 788.7046983776.

The spelling of 490617781 in words is "four hundred ninety million, six hundred seventeen thousand, seven hundred eighty-one".