2005601609 has 4 divisors (see below), whose sum is σ = 2187929040. Its totient is φ = 1823274180.

The previous prime is 2005601599. The next prime is 2005601617. The reversal of 2005601609 is 9061065002.

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 2005601609 - 2¹² = 2005597513 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2005601509) 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, 91163699 + ... + 91163720.

It is an arithmetic number, because the mean of its divisors is an integer number (546982260).

Almost surely, 2^2005601609 is an apocalyptic number.

It is an amenable number.

2005601609 is a deficient number, since it is larger than the sum of its proper divisors (182327431).

2005601609 is a wasteful number, since it uses less digits than its factorization.

2005601609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 182327430.

The product of its (nonzero) digits is 3240, while the sum is 29.

The square root of 2005601609 is about 44783.9436517152. The cubic root of 2005601609 is about 1261.0962176205.

The spelling of 2005601609 in words is "two billion, five million, six hundred one thousand, six hundred nine".