2115251552549 has 2 divisors, whose sum is σ = 2115251552550. Its totient is φ = 2115251552548.

The previous prime is 2115251552537. The next prime is 2115251552633. The reversal of 2115251552549 is 9452551525112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2098421679649 + 16829872900 = 1448593^2 + 129730^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2115251552549 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2115251552149) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1057625776274 + 1057625776275.

It is an arithmetic number, because the mean of its divisors is an integer number (1057625776275).

Almost surely, 2^{2115251552549} is an apocalyptic number.

It is an amenable number.

2115251552549 is a deficient number, since it is larger than the sum of its proper divisors (1).

2115251552549 is an equidigital number, since it uses as much as digits as its factorization.

2115251552549 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 900000, while the sum is 47.

The spelling of 2115251552549 in words is "two trillion, one hundred fifteen billion, two hundred fifty-one million, five hundred fifty-two thousand, five hundred forty-nine".