2609531321 has 4 divisors (see below), whose sum is σ = 2665053312. Its totient is φ = 2554009332.

The previous prime is 2609531311. The next prime is 2609531347. The reversal of 2609531321 is 1231359062.

2609531321 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 not a de Polignac number, because 2609531321 - 2¹⁸ = 2609269177 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 (2609531311) 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, 27760925 + ... + 27761018.

It is an arithmetic number, because the mean of its divisors is an integer number (666263328).

Almost surely, 2^2609531321 is an apocalyptic number.

It is an amenable number.

2609531321 is a deficient number, since it is larger than the sum of its proper divisors (55521991).

2609531321 is an equidigital number, since it uses as much as digits as its factorization.

2609531321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55521990.

The product of its (nonzero) digits is 9720, while the sum is 32.

The square root of 2609531321 is about 51083.5719287522. The cubic root of 2609531321 is about 1376.7471029679.

The spelling of 2609531321 in words is "two billion, six hundred nine million, five hundred thirty-one thousand, three hundred twenty-one".