2891821279 has 2 divisors, whose sum is σ = 2891821280. Its totient is φ = 2891821278.

The previous prime is 2891821277. The next prime is 2891821291. The reversal of 2891821279 is 9721281982.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2891821279 - 2¹ = 2891821277 is a prime.

Together with 2891821277, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2891821271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1445910639 + 1445910640.

It is an arithmetic number, because the mean of its divisors is an integer number (1445910640).

Almost surely, 2^2891821279 is an apocalyptic number.

2891821279 is a deficient number, since it is larger than the sum of its proper divisors (1).

2891821279 is an equidigital number, since it uses as much as digits as its factorization.

2891821279 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 290304, while the sum is 49.

The square root of 2891821279 is about 53775.6569369450. The cubic root of 2891821279 is about 1424.7012861506.

The spelling of 2891821279 in words is "two billion, eight hundred ninety-one million, eight hundred twenty-one thousand, two hundred seventy-nine".