1804603561 has 8 divisors (see below), whose sum is σ = 1912365000. Its totient is φ = 1699877760.

The previous prime is 1804603547. The next prime is 1804603571. The reversal of 1804603561 is 1653064081.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 229704336 + 1574899225 = 15156^2 + 39685^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1804603561 - 2⁹ = 1804603049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1804603511) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 757686 + ... + 760063.

It is an arithmetic number, because the mean of its divisors is an integer number (239045625).

Almost surely, 2^1804603561 is an apocalyptic number.

It is an amenable number.

1804603561 is a deficient number, since it is larger than the sum of its proper divisors (107761439).

1804603561 is a wasteful number, since it uses less digits than its factorization.

1804603561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1517819.

The product of its (nonzero) digits is 17280, while the sum is 34.

The square root of 1804603561 is about 42480.6257133767. The cubic root of 1804603561 is about 1217.4765454711.

The spelling of 1804603561 in words is "one billion, eight hundred four million, six hundred three thousand, five hundred sixty-one".