1540234543 has 4 divisors (see below), whose sum is σ = 1540331208. Its totient is φ = 1540137880.

The previous prime is 1540234529. The next prime is 1540234571. The reversal of 1540234543 is 3454320451.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 3454320451 = 20521 ⋅168331.

It is a cyclic number.

It is not a de Polignac number, because 1540234543 - 2²⁹ = 1003363631 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1540234513) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18148 + ... + 58393.

It is an arithmetic number, because the mean of its divisors is an integer number (385082802).

Almost surely, 2^1540234543 is an apocalyptic number.

1540234543 is a deficient number, since it is larger than the sum of its proper divisors (96665).

1540234543 is an equidigital number, since it uses as much as digits as its factorization.

1540234543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96664.

The product of its (nonzero) digits is 28800, while the sum is 31.

The square root of 1540234543 is about 39245.8219814543. The cubic root of 1540234543 is about 1154.8589729300.

Adding to 1540234543 its reverse (3454320451), we get a palindrome (4994554994).

The spelling of 1540234543 in words is "one billion, five hundred forty million, two hundred thirty-four thousand, five hundred forty-three".