490637281 has 2 divisors, whose sum is σ = 490637282. Its totient is φ = 490637280.

The previous prime is 490637263. The next prime is 490637293. The reversal of 490637281 is 182736094.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 458816400 + 31820881 = 21420^2 + 5641^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-490637281 is a prime.

It is a super-2 number, since 2×490637281² = 481449883014145922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (490637881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 245318640 + 245318641.

It is an arithmetic number, because the mean of its divisors is an integer number (245318641).

Almost surely, 2^490637281 is an apocalyptic number.

It is an amenable number.

490637281 is a deficient number, since it is larger than the sum of its proper divisors (1).

490637281 is an equidigital number, since it uses as much as digits as its factorization.

490637281 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72576, while the sum is 40.

The square root of 490637281 is about 22150.3336543719. Note that the first 3 decimals coincide. The cubic root of 490637281 is about 788.7151474743.

The spelling of 490637281 in words is "four hundred ninety million, six hundred thirty-seven thousand, two hundred eighty-one".