490865121 has 6 divisors (see below), whose sum is σ = 709027410. Its totient is φ = 327243408.

The previous prime is 490865119. The next prime is 490865189. The reversal of 490865121 is 121568094.

It can be written as a sum of positive squares in only one way, i.e., 334890000 + 155975121 = 18300^2 + 12489^2 .

It is not a de Polignac number, because 490865121 - 2¹ = 490865119 is a prime.

It is not an unprimeable number, because it can be changed into a prime (490865521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 27270276 + ... + 27270293.

It is an arithmetic number, because the mean of its divisors is an integer number (118171235).

Almost surely, 2^490865121 is an apocalyptic number.

It is an amenable number.

490865121 is a deficient number, since it is larger than the sum of its proper divisors (218162289).

490865121 is a wasteful number, since it uses less digits than its factorization.

490865121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54540575 (or 54540572 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 36.

The square root of 490865121 is about 22155.4760950876. The cubic root of 490865121 is about 788.8372152808.

The spelling of 490865121 in words is "four hundred ninety million, eight hundred sixty-five thousand, one hundred twenty-one".