2145540543 has 4 divisors (see below), whose sum is σ = 2860720728. Its totient is φ = 1430360360.

The previous prime is 2145540521. The next prime is 2145540557. The reversal of 2145540543 is 3450455412.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2145540543 - 2⁵ = 2145540511 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2145540563) 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, 357590088 + ... + 357590093.

It is an arithmetic number, because the mean of its divisors is an integer number (715180182).

Almost surely, 2^2145540543 is an apocalyptic number.

2145540543 is a deficient number, since it is larger than the sum of its proper divisors (715180185).

2145540543 is an equidigital number, since it uses as much as digits as its factorization.

2145540543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 715180184.

The product of its (nonzero) digits is 48000, while the sum is 33.

The square root of 2145540543 is about 46319.9799546589. The cubic root of 2145540543 is about 1289.7699132934.

Adding to 2145540543 its reverse (3450455412), we get a palindrome (5595995955).

The spelling of 2145540543 in words is "two billion, one hundred forty-five million, five hundred forty thousand, five hundred forty-three".