279242543821 has 4 divisors (see below), whose sum is σ = 285736556512. Its totient is φ = 272748531132.

The previous prime is 279242543809. The next prime is 279242543831. The reversal of 279242543821 is 128345242972.

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 279242543821 - 2⁹ = 279242543309 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 (279242543831) 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, 3247006281 + ... + 3247006366.

It is an arithmetic number, because the mean of its divisors is an integer number (71434139128).

Almost surely, 2^279242543821 is an apocalyptic number.

It is an amenable number.

279242543821 is a deficient number, since it is larger than the sum of its proper divisors (6494012691).

279242543821 is an equidigital number, since it uses as much as digits as its factorization.

279242543821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6494012690.

The product of its digits is 1935360, while the sum is 49.

The spelling of 279242543821 in words is "two hundred seventy-nine billion, two hundred forty-two million, five hundred forty-three thousand, eight hundred twenty-one".