2849561813821 has 2 divisors, whose sum is σ = 2849561813822. Its totient is φ = 2849561813820.

The previous prime is 2849561813801. The next prime is 2849561813869. The reversal of 2849561813821 is 1283181659482.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1858352409796 + 991209404025 = 1363214^2 + 995595^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2849561813821 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2849561813801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1424780906910 + 1424780906911.

It is an arithmetic number, because the mean of its divisors is an integer number (1424780906911).

Almost surely, 2^{2849561813821} is an apocalyptic number.

It is an amenable number.

2849561813821 is a deficient number, since it is larger than the sum of its proper divisors (1).

2849561813821 is an equidigital number, since it uses as much as digits as its factorization.

2849561813821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6635520, while the sum is 58.

The spelling of 2849561813821 in words is "two trillion, eight hundred forty-nine billion, five hundred sixty-one million, eight hundred thirteen thousand, eight hundred twenty-one".