2543123505 has 32 divisors (see below), whose sum is σ = 4386049920. Its totient is φ = 1250841600.

The previous prime is 2543123503. The next prime is 2543123509. The reversal of 2543123505 is 5053213452.

It is not a de Polignac number, because 2543123505 - 2¹ = 2543123503 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2543123503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 228766 + ... + 239624.

It is an arithmetic number, because the mean of its divisors is an integer number (137064060).

Almost surely, 2^2543123505 is an apocalyptic number.

It is an amenable number.

2543123505 is a deficient number, since it is larger than the sum of its proper divisors (1842926415).

2543123505 is a wasteful number, since it uses less digits than its factorization.

2543123505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12081.

The product of its (nonzero) digits is 18000, while the sum is 30.

The square root of 2543123505 is about 50429.3912812756. The cubic root of 2543123505 is about 1364.9680439056.

Adding to 2543123505 its reverse (5053213452), we get a palindrome (7596336957).

The spelling of 2543123505 in words is "two billion, five hundred forty-three million, one hundred twenty-three thousand, five hundred five".