2509981321 has 4 divisors (see below), whose sum is σ = 2577818692. Its totient is φ = 2442143952.

The previous prime is 2509981307. The next prime is 2509981361. The reversal of 2509981321 is 1231899052.

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 1211388025 + 1298593296 = 34805^2 + 36036^2 .

It is a cyclic number.

It is not a de Polignac number, because 2509981321 - 2⁵ = 2509981289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2509981361) 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, 33918630 + ... + 33918703.

It is an arithmetic number, because the mean of its divisors is an integer number (644454673).

Almost surely, 2^2509981321 is an apocalyptic number.

It is an amenable number.

2509981321 is a deficient number, since it is larger than the sum of its proper divisors (67837371).

2509981321 is an equidigital number, since it uses as much as digits as its factorization.

2509981321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67837370.

The product of its (nonzero) digits is 38880, while the sum is 40.

The square root of 2509981321 is about 50099.7137816176. The cubic root of 2509981321 is about 1359.0126413755.

The spelling of 2509981321 in words is "two billion, five hundred nine million, nine hundred eighty-one thousand, three hundred twenty-one".