490961509 has 2 divisors, whose sum is σ = 490961510. Its totient is φ = 490961508.

The previous prime is 490961507. The next prime is 490961533. The reversal of 490961509 is 905169094.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 357096609 + 133864900 = 18897^2 + 11570^2 .

It is a cyclic number.

It is not a de Polignac number, because 490961509 - 2¹ = 490961507 is a prime.

Together with 490961507, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (490961507) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 245480754 + 245480755.

It is an arithmetic number, because the mean of its divisors is an integer number (245480755).

Almost surely, 2^490961509 is an apocalyptic number.

It is an amenable number.

490961509 is a deficient number, since it is larger than the sum of its proper divisors (1).

490961509 is an equidigital number, since it uses as much as digits as its factorization.

490961509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 87480, while the sum is 43.

The square root of 490961509 is about 22157.6512518814. The cubic root of 490961509 is about 788.8888448507. Note that the first 4 decimals are identical.

It can be divided in two parts, 49096 and 1509, that added together give a palindrome (50605).

The spelling of 490961509 in words is "four hundred ninety million, nine hundred sixty-one thousand, five hundred nine".