2081951752609 has 7 divisors (see below), whose sum is σ = 2100540607543. Its totient is φ = 2063527400816.

The previous prime is 2081951752603. The next prime is 2081951752631. The reversal of 2081951752609 is 9062571591802.

The square root of 2081951752609 is 1442897.

The cubic root of 2081951752609 is 12769.

It is a perfect power (a square, a cube, a 6-th power), and thus also a powerful number.

It can be written as a sum of positive squares in 3 ways, for example, as 314838821025 + 1767112931584 = 561105^2 + 1329328^2 .

It is not a de Polignac number, because 2081951752609 - 2²³ = 2081943364001 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2081951752609.

It is not an unprimeable number, because it can be changed into a prime (2081951752603) by changing a digit.

It is a polite number, since it can be written in 6 ways as a sum of consecutive naturals, for example, 18424351737 + ... + 18424351849.

It is an arithmetic number, because the mean of its divisors is an integer number (300077229649).

Almost surely, 2^{2081951752609} is an apocalyptic number.

2081951752609 is the 1442897-th square number.

2081951752609 is the 721449-th centered octagonal number.

It is an amenable number.

2081951752609 is a deficient number, since it is larger than the sum of its proper divisors (18588854934).

2081951752609 is an frugal number, since it uses more digits than its factorization.

2081951752609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 678 (or 113 counting only the distinct ones).

The product of its (nonzero) digits is 2721600, while the sum is 55.

The spelling of 2081951752609 in words is "two trillion, eighty-one billion, nine hundred fifty-one million, seven hundred fifty-two thousand, six hundred nine".