2591343442549 has 2 divisors, whose sum is σ = 2591343442550. Its totient is φ = 2591343442548.

The previous prime is 2591343442537. The next prime is 2591343442607. The reversal of 2591343442549 is 9452443431952.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2590432308324 + 911134225 = 1609482^2 + 30185^2 .

It is a cyclic number.

It is not a de Polignac number, because 2591343442549 - 2⁵ = 2591343442517 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2591343442549.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2591343445549) 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, 1295671721274 + 1295671721275.

It is an arithmetic number, because the mean of its divisors is an integer number (1295671721275).

Almost surely, 2^{2591343442549} is an apocalyptic number.

It is an amenable number.

2591343442549 is a deficient number, since it is larger than the sum of its proper divisors (1).

2591343442549 is an equidigital number, since it uses as much as digits as its factorization.

2591343442549 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18662400, while the sum is 55.

The spelling of 2591343442549 in words is "two trillion, five hundred ninety-one billion, three hundred forty-three million, four hundred forty-two thousand, five hundred forty-nine".