543187643021 has 4 divisors (see below), whose sum is σ = 545623462272. Its totient is φ = 540751823772.

The previous prime is 543187643017. The next prime is 543187643029. The reversal of 543187643021 is 120346781345.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 543187643021 - 2² = 543187643017 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 (543187643029) 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, 1217909291 + ... + 1217909736.

It is an arithmetic number, because the mean of its divisors is an integer number (136405865568).

Almost surely, 2^543187643021 is an apocalyptic number.

It is an amenable number.

543187643021 is a deficient number, since it is larger than the sum of its proper divisors (2435819251).

543187643021 is a wasteful number, since it uses less digits than its factorization.

543187643021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2435819250.

The product of its (nonzero) digits is 483840, while the sum is 44.

The spelling of 543187643021 in words is "five hundred forty-three billion, one hundred eighty-seven million, six hundred forty-three thousand, twenty-one".