490402081 has 4 divisors (see below), whose sum is σ = 528125332. Its totient is φ = 452678832.

The previous prime is 490402069. The next prime is 490402091. The reversal of 490402081 is 180204094.

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 162792081 + 327610000 = 12759^2 + 18100^2 .

It is a cyclic number.

It is not a de Polignac number, because 490402081 - 2⁷ = 490401953 is a prime.

It is a super-2 number, since 2×490402081² = 480988402098261122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (490402001) 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, 18861606 + ... + 18861631.

It is an arithmetic number, because the mean of its divisors is an integer number (132031333).

Almost surely, 2^490402081 is an apocalyptic number.

It is an amenable number.

490402081 is a deficient number, since it is larger than the sum of its proper divisors (37723251).

490402081 is a wasteful number, since it uses less digits than its factorization.

490402081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37723250.

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 490402081 is about 22145.0238428411. The cubic root of 490402081 is about 788.5890968185.

The spelling of 490402081 in words is "four hundred ninety million, four hundred two thousand, eighty-one".