2543506813 has 4 divisors (see below), whose sum is σ = 2585203708. Its totient is φ = 2501809920.

The previous prime is 2543506811. The next prime is 2543506829. The reversal of 2543506813 is 3186053452.

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 235376964 + 2308129849 = 15342^2 + 48043^2 .

It is a cyclic number.

It is not a de Polignac number, because 2543506813 - 2¹ = 2543506811 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 (2543506811) 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, 20848356 + ... + 20848477.

It is an arithmetic number, because the mean of its divisors is an integer number (646300927).

Almost surely, 2^2543506813 is an apocalyptic number.

It is an amenable number.

2543506813 is a deficient number, since it is larger than the sum of its proper divisors (41696895).

2543506813 is an equidigital number, since it uses as much as digits as its factorization.

2543506813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41696894.

The product of its (nonzero) digits is 86400, while the sum is 37.

The square root of 2543506813 is about 50433.1915805454. The cubic root of 2543506813 is about 1365.0366179624.

The spelling of 2543506813 in words is "two billion, five hundred forty-three million, five hundred six thousand, eight hundred thirteen".