2543505406 has 16 divisors (see below), whose sum is σ = 4109624064. Its totient is φ = 1173672864.

The previous prime is 2543505403. The next prime is 2543505431. The reversal of 2543505406 is 6045053452.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2543505401) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 172771 + ... + 186913.

It is an arithmetic number, because the mean of its divisors is an integer number (256851504).

Almost surely, 2^2543505406 is an apocalyptic number.

2543505406 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

2543505406 is a deficient number, since it is larger than the sum of its proper divisors (1566118658).

2543505406 is a wasteful number, since it uses less digits than its factorization.

2543505406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21075.

The product of its (nonzero) digits is 72000, while the sum is 34.

The square root of 2543505406 is about 50433.1776313966. The cubic root of 2543505406 is about 1365.0363662618.

Adding to 2543505406 its reverse (6045053452), we get a palindrome (8588558858).

The spelling of 2543505406 in words is "two billion, five hundred forty-three million, five hundred five thousand, four hundred six".