490809427721 has 4 divisors (see below), whose sum is σ = 490811013444. Its totient is φ = 490807842000.

The previous prime is 490809427709. The next prime is 490809427723. The reversal of 490809427721 is 127724908094.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 282028972096 + 208780455625 = 531064^2 + 456925^2 .

It is a cyclic number.

It is not a de Polignac number, because 490809427721 - 2⁶ = 490809427657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (490809427723) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 160430 + ... + 1003671.

It is an arithmetic number, because the mean of its divisors is an integer number (122702753361).

Almost surely, 2^490809427721 is an apocalyptic number.

It is an amenable number.

490809427721 is a deficient number, since it is larger than the sum of its proper divisors (1585723).

490809427721 is a wasteful number, since it uses less digits than its factorization.

490809427721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1585722.

The product of its (nonzero) digits is 2032128, while the sum is 53.

The spelling of 490809427721 in words is "four hundred ninety billion, eight hundred nine million, four hundred twenty-seven thousand, seven hundred twenty-one".