2649505729 has 4 divisors (see below), whose sum is σ = 2853313876. Its totient is φ = 2445697584.

The previous prime is 2649505717. The next prime is 2649505739. The reversal of 2649505729 is 9275059462.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9275059462 = 2 ⋅4637529731.

It can be written as a sum of positive squares in 2 ways, for example, as 1433379600 + 1216126129 = 37860^2 + 34873^2 .

It is a cyclic number.

It is not a de Polignac number, because 2649505729 - 2²³ = 2641117121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2649505739) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 101904054 + ... + 101904079.

It is an arithmetic number, because the mean of its divisors is an integer number (713328469).

Almost surely, 2^2649505729 is an apocalyptic number.

It is an amenable number.

2649505729 is a deficient number, since it is larger than the sum of its proper divisors (203808147).

2649505729 is a wasteful number, since it uses less digits than its factorization.

2649505729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 203808146.

The product of its (nonzero) digits is 1360800, while the sum is 49.

The square root of 2649505729 is about 51473.3496967120. The cubic root of 2649505729 is about 1383.7414623446.

The spelling of 2649505729 in words is "two billion, six hundred forty-nine million, five hundred five thousand, seven hundred twenty-nine".