2872209649 has 3 divisors (see below), whose sum is σ = 2872263243. Its totient is φ = 2872156056.

The previous prime is 2872209643. The next prime is 2872209679. The reversal of 2872209649 is 9469022782.

The square root of 2872209649 is 53593.

It is a perfect power (a square), and thus also a powerful number.

2872209649 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 brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 1317327025 + 1554882624 = 36295^2 + 39432^2 .

It is not a de Polignac number, because 2872209649 - 2¹³ = 2872201457 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2872209643) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 26797 + ... + 80389.

It is an arithmetic number, because the mean of its divisors is an integer number (957421081).

Almost surely, 2^2872209649 is an apocalyptic number.

2872209649 is the 53593-rd square number.

2872209649 is the 26797-th centered octagonal number.

It is an amenable number.

2872209649 is a deficient number, since it is larger than the sum of its proper divisors (53594).

2872209649 is an frugal number, since it uses more digits than its factorization.

2872209649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107186 (or 53593 counting only the distinct ones).

The product of its (nonzero) digits is 870912, while the sum is 49.

The cubic root of 2872209649 is about 1421.4733185806.

Multiplying 2872209649 by its sum of digits (49), we get a square (140738272801 = 375151²).

It can be divided in two parts, 2872 and 209649, that added together give a square (212521 = 461²).

The spelling of 2872209649 in words is "two billion, eight hundred seventy-two million, two hundred nine thousand, six hundred forty-nine".