2791857298621 has 2 divisors, whose sum is σ = 2791857298622. Its totient is φ = 2791857298620.

The previous prime is 2791857298619. The next prime is 2791857298631. The reversal of 2791857298621 is 1268927581972.

2791857298621 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2575418345721 + 216438952900 = 1604811^2 + 465230^2 .

It is a cyclic number.

It is not a de Polignac number, because 2791857298621 - 2¹ = 2791857298619 is a prime.

Together with 2791857298619, 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 (2791857298631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1395928649310 + 1395928649311.

It is an arithmetic number, because the mean of its divisors is an integer number (1395928649311).

Almost surely, 2^{2791857298621} is an apocalyptic number.

It is an amenable number.

2791857298621 is a deficient number, since it is larger than the sum of its proper divisors (1).

2791857298621 is an equidigital number, since it uses as much as digits as its factorization.

2791857298621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 60963840, while the sum is 67.

The spelling of 2791857298621 in words is "two trillion, seven hundred ninety-one billion, eight hundred fifty-seven million, two hundred ninety-eight thousand, six hundred twenty-one".