1721534534543 has 2 divisors, whose sum is σ = 1721534534544. Its totient is φ = 1721534534542.

The previous prime is 1721534534539. The next prime is 1721534534549. The reversal of 1721534534543 is 3454354351271.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1721534534543 - 2² = 1721534534539 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1721534534549) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 860767267271 + 860767267272.

It is an arithmetic number, because the mean of its divisors is an integer number (860767267272).

Almost surely, 2^{1721534534543} is an apocalyptic number.

1721534534543 is a deficient number, since it is larger than the sum of its proper divisors (1).

1721534534543 is an equidigital number, since it uses as much as digits as its factorization.

1721534534543 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3024000, while the sum is 47.

The spelling of 1721534534543 in words is "one trillion, seven hundred twenty-one billion, five hundred thirty-four million, five hundred thirty-four thousand, five hundred forty-three".