489990901 has 2 divisors, whose sum is σ = 489990902. Its totient is φ = 489990900.

The previous prime is 489990887. The next prime is 489990953. The reversal of 489990901 is 109099984.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 389470225 + 100520676 = 19735^2 + 10026^2 .

It is a cyclic number.

It is not a de Polignac number, because 489990901 - 2²³ = 481602293 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (489990961) 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, 244995450 + 244995451.

It is an arithmetic number, because the mean of its divisors is an integer number (244995451).

Almost surely, 2^489990901 is an apocalyptic number.

It is an amenable number.

489990901 is a deficient number, since it is larger than the sum of its proper divisors (1).

489990901 is an equidigital number, since it uses as much as digits as its factorization.

489990901 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 209952, while the sum is 49.

The square root of 489990901 is about 22135.7380947643. The cubic root of 489990901 is about 788.3686364091.

The spelling of 489990901 in words is "four hundred eighty-nine million, nine hundred ninety thousand, nine hundred one".