2545217729 has 4 divisors (see below), whose sum is σ = 2547547476. Its totient is φ = 2542887984.

The previous prime is 2545217699. The next prime is 2545217749. The reversal of 2545217729 is 9277125452.

2545217729 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.

It can be written as a sum of positive squares in 2 ways, for example, as 1882258225 + 662959504 = 43385^2 + 25748^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2545217729 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 2545217729.

It is not an unprimeable number, because it can be changed into a prime (2545217749) 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, 1163234 + ... + 1165419.

It is an arithmetic number, because the mean of its divisors is an integer number (636886869).

Almost surely, 2^2545217729 is an apocalyptic number.

It is an amenable number.

2545217729 is a deficient number, since it is larger than the sum of its proper divisors (2329747).

2545217729 is a wasteful number, since it uses less digits than its factorization.

2545217729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2329746.

The product of its digits is 352800, while the sum is 44.

The square root of 2545217729 is about 50450.1509313897. The cubic root of 2545217729 is about 1365.3426179983.

The spelling of 2545217729 in words is "two billion, five hundred forty-five million, two hundred seventeen thousand, seven hundred twenty-nine".