2000194561 has 4 divisors (see below), whose sum is σ = 2001439300. Its totient is φ = 1998949824.

The previous prime is 2000194541. The next prime is 2000194589. The reversal of 2000194561 is 1654910002.

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 1795132161 + 205062400 = 42369^2 + 14320^2 .

It is a cyclic number.

It is not a de Polignac number, because 2000194561 - 2⁵ = 2000194529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2000194531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 619956 + ... + 623173.

It is an arithmetic number, because the mean of its divisors is an integer number (500359825).

Almost surely, 2^2000194561 is an apocalyptic number.

It is an amenable number.

2000194561 is a deficient number, since it is larger than the sum of its proper divisors (1244739).

2000194561 is a wasteful number, since it uses less digits than its factorization.

2000194561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1244738.

The product of its (nonzero) digits is 2160, while the sum is 28.

The square root of 2000194561 is about 44723.5347552047. The cubic root of 2000194561 is about 1259.9619038200.

The spelling of 2000194561 in words is "two billion, one hundred ninety-four thousand, five hundred sixty-one".