2861081804249 has 2 divisors, whose sum is σ = 2861081804250. Its totient is φ = 2861081804248.

The previous prime is 2861081804239. The next prime is 2861081804293. The reversal of 2861081804249 is 9424081801682.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1572686548624 + 1288395255625 = 1254068^2 + 1135075^2 .

It is a cyclic number.

It is not a de Polignac number, because 2861081804249 - 2²⁸ = 2860813368793 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2861081804249.

It is not a weakly prime, because it can be changed into another prime (2861081804239) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1430540902124 + 1430540902125.

It is an arithmetic number, because the mean of its divisors is an integer number (1430540902125).

Almost surely, 2^{2861081804249} is an apocalyptic number.

It is an amenable number.

2861081804249 is a deficient number, since it is larger than the sum of its proper divisors (1).

2861081804249 is an equidigital number, since it uses as much as digits as its factorization.

2861081804249 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1769472, while the sum is 53.

The spelling of 2861081804249 in words is "two trillion, eight hundred sixty-one billion, eighty-one million, eight hundred four thousand, two hundred forty-nine".