490666801 has 9 divisors (see below), whose sum is σ = 521627691. Its totient is φ = 461449632.

The previous prime is 490666789. The next prime is 490666807. The reversal of 490666801 is 108666094.

The square root of 490666801 is 22151.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 382007025 + 108659776 = 19545^2 + 10424^2 .

It is not a de Polignac number, because 490666801 - 2⁹ = 490666289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (490666807) 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 in 8 ways as a sum of consecutive naturals, for example, 375916 + ... + 377218.

Almost surely, 2^490666801 is an apocalyptic number.

490666801 is the 22151-st square number.

490666801 is the 11076-th centered octagonal number.

It is an amenable number.

490666801 is a deficient number, since it is larger than the sum of its proper divisors (30960890).

490666801 is an frugal number, since it uses more digits than its factorization.

490666801 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2640 (or 1320 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 40.

The cubic root of 490666801 is about 788.7309652723.

The spelling of 490666801 in words is "four hundred ninety million, six hundred sixty-six thousand, eight hundred one".