2801609 has 4 divisors (see below), whose sum is σ = 2826516. Its totient is φ = 2776704.

The previous prime is 2801599. The next prime is 2801611. The reversal of 2801609 is 9061082.

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 1373584 + 1428025 = 1172^2 + 1195^2 .

It is a cyclic number.

It is not a de Polignac number, because 2801609 - 2⁴ = 2801593 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2801509) 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, 12284 + ... + 12509.

It is an arithmetic number, because the mean of its divisors is an integer number (706629).

2^2801609 is an apocalyptic number.

It is an amenable number.

2801609 is a deficient number, since it is larger than the sum of its proper divisors (24907).

2801609 is a wasteful number, since it uses less digits than its factorization.

2801609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24906.

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 2801609 is about 1673.8007647268. The cubic root of 2801609 is about 140.9729673374.

The spelling of 2801609 in words is "two million, eight hundred one thousand, six hundred nine".