1721534504543 has 4 divisors (see below), whose sum is σ = 1967468005200. Its totient is φ = 1475601003888.

The previous prime is 1721534504527. The next prime is 1721534504581. The reversal of 1721534504543 is 3454054351271.

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 1721534504543 - 2⁴ = 1721534504527 is a prime.

It is a super-2 number, since 2×1721534504543² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1721534504494 and 1721534504503.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1721534534543) 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, 122966750318 + ... + 122966750331.

It is an arithmetic number, because the mean of its divisors is an integer number (491867001300).

Almost surely, 2^{1721534504543} is an apocalyptic number.

1721534504543 is a deficient number, since it is larger than the sum of its proper divisors (245933500657).

1721534504543 is an equidigital number, since it uses as much as digits as its factorization.

1721534504543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 245933500656.

The product of its (nonzero) digits is 1008000, while the sum is 44.

The spelling of 1721534504543 in words is "one trillion, seven hundred twenty-one billion, five hundred thirty-four million, five hundred four thousand, five hundred forty-three".