2543213549 has 4 divisors (see below), whose sum is σ = 2692814364. Its totient is φ = 2393612736.

The previous prime is 2543213527. The next prime is 2543213567. The reversal of 2543213549 is 9453123452.

It is a happy number.

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 1149684649 + 1393528900 = 33907^2 + 37330^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2543213549 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2543213509) 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, 74800382 + ... + 74800415.

It is an arithmetic number, because the mean of its divisors is an integer number (673203591).

Almost surely, 2^2543213549 is an apocalyptic number.

It is an amenable number.

2543213549 is a deficient number, since it is larger than the sum of its proper divisors (149600815).

2543213549 is a wasteful number, since it uses less digits than its factorization.

2543213549 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149600814.

The product of its digits is 129600, while the sum is 38.

The square root of 2543213549 is about 50430.2840463942. The cubic root of 2543213549 is about 1364.9841534565.

The spelling of 2543213549 in words is "two billion, five hundred forty-three million, two hundred thirteen thousand, five hundred forty-nine".