543261161021 has 4 divisors (see below), whose sum is σ = 549365219100. Its totient is φ = 537157102944.

The previous prime is 543261160991. The next prime is 543261161057. The reversal of 543261161021 is 120161162345.

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

It can be written as a sum of positive squares in 2 ways, for example, as 247337128900 + 295924032121 = 497330^2 + 543989^2 .

It is a cyclic number.

It is not a de Polignac number, because 543261161021 - 2⁶ = 543261160957 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (543261361021) 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, 3052028906 + ... + 3052029083.

It is an arithmetic number, because the mean of its divisors is an integer number (137341304775).

Almost surely, 2^543261161021 is an apocalyptic number.

It is an amenable number.

543261161021 is a deficient number, since it is larger than the sum of its proper divisors (6104058079).

543261161021 is an equidigital number, since it uses as much as digits as its factorization.

543261161021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6104058078.

The product of its (nonzero) digits is 8640, while the sum is 32.

The spelling of 543261161021 in words is "five hundred forty-three billion, two hundred sixty-one million, one hundred sixty-one thousand, twenty-one".