1540543 has 2 divisors, whose sum is σ = 1540544. Its totient is φ = 1540542.

The previous prime is 1540541. The next prime is 1540559. The reversal of 1540543 is 3450451.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1540543 - 2¹ = 1540541 is a prime.

Together with 1540541, it forms a pair of twin primes.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1540541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 770271 + 770272.

It is an arithmetic number, because the mean of its divisors is an integer number (770272).

2^1540543 is an apocalyptic number.

1540543 is a deficient number, since it is larger than the sum of its proper divisors (1).

1540543 is an equidigital number, since it uses as much as digits as its factorization.

1540543 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1200, while the sum is 22.

The square root of 1540543 is about 1241.1861262518. The cubic root of 1540543 is about 115.4936060877.

Adding to 1540543 its reverse (3450451), we get a palindrome (4990994).

The spelling of 1540543 in words is "one million, five hundred forty thousand, five hundred forty-three".