2279043821 has 2 divisors, whose sum is σ = 2279043822. Its totient is φ = 2279043820.

The previous prime is 2279043791. The next prime is 2279043857. The reversal of 2279043821 is 1283409722.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2276625796 + 2418025 = 47714^2 + 1555^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2279043821 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2279043121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1139521910 + 1139521911.

It is an arithmetic number, because the mean of its divisors is an integer number (1139521911).

Almost surely, 2^2279043821 is an apocalyptic number.

It is an amenable number.

2279043821 is a deficient number, since it is larger than the sum of its proper divisors (1).

2279043821 is an equidigital number, since it uses as much as digits as its factorization.

2279043821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48384, while the sum is 38.

The square root of 2279043821 is about 47739.3320125031. The cubic root of 2279043821 is about 1315.9848571118.

The spelling of 2279043821 in words is "two billion, two hundred seventy-nine million, forty-three thousand, eight hundred twenty-one".