2106004561 has 4 divisors (see below), whose sum is σ = 2173940224. Its totient is φ = 2038068900.

The previous prime is 2106004559. The next prime is 2106004573. The reversal of 2106004561 is 1654006012.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2106004561 - 2¹ = 2106004559 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2106004541) 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, 33967785 + ... + 33967846.

It is an arithmetic number, because the mean of its divisors is an integer number (543485056).

Almost surely, 2^2106004561 is an apocalyptic number.

It is an amenable number.

2106004561 is a deficient number, since it is larger than the sum of its proper divisors (67935663).

2106004561 is an equidigital number, since it uses as much as digits as its factorization.

2106004561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67935662.

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 2106004561 is about 45891.2253159577. The cubic root of 2106004561 is about 1281.7985298457.

The spelling of 2106004561 in words is "two billion, one hundred six million, four thousand, five hundred sixty-one".