2861609 has 4 divisors (see below), whose sum is σ = 3012240. Its totient is φ = 2710980.

The previous prime is 2861603. The next prime is 2861623. The reversal of 2861609 is 9061682.

2861609 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 a de Polignac number, because none of the positive numbers 2^k-2861609 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2861603) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 75287 + ... + 75324.

It is an arithmetic number, because the mean of its divisors is an integer number (753060).

2^2861609 is an apocalyptic number.

It is an amenable number.

2861609 is a deficient number, since it is larger than the sum of its proper divisors (150631).

2861609 is a wasteful number, since it uses less digits than its factorization.

2861609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 150630.

The product of its (nonzero) digits is 5184, while the sum is 32.

The square root of 2861609 is about 1691.6290964629. The cubic root of 2861609 is about 141.9722388367.

The spelling of 2861609 in words is "two million, eight hundred sixty-one thousand, six hundred nine".