2921609 has 4 divisors (see below), whose sum is σ = 2932740. Its totient is φ = 2910480.

The previous prime is 2921599. The next prime is 2921617. The reversal of 2921609 is 9061292.

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 595984 + 2325625 = 772^2 + 1525^2 .

It is a cyclic number.

It is not a de Polignac number, because 2921609 - 2⁴ = 2921593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2921629) 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, 5162 + ... + 5699.

It is an arithmetic number, because the mean of its divisors is an integer number (733185).

2^2921609 is an apocalyptic number.

It is an amenable number.

2921609 is a deficient number, since it is larger than the sum of its proper divisors (11131).

2921609 is a wasteful number, since it uses less digits than its factorization.

2921609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11130.

The product of its (nonzero) digits is 1944, while the sum is 29.

The square root of 2921609 is about 1709.2714822403. The cubic root of 2921609 is about 142.9576381930.

The spelling of 2921609 in words is "two million, nine hundred twenty-one thousand, six hundred nine".