1949281809089 has 2 divisors, whose sum is σ = 1949281809090. Its totient is φ = 1949281809088.

The previous prime is 1949281809053. The next prime is 1949281809091. The reversal of 1949281809089 is 9809081829491.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1578498242689 + 370783566400 = 1256383^2 + 608920^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1949281809089 is a prime.

Together with 1949281809091, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1949281809049) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 974640904544 + 974640904545.

It is an arithmetic number, because the mean of its divisors is an integer number (974640904545).

Almost surely, 2^{1949281809089} is an apocalyptic number.

It is an amenable number.

1949281809089 is a deficient number, since it is larger than the sum of its proper divisors (1).

1949281809089 is an equidigital number, since it uses as much as digits as its factorization.

1949281809089 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 26873856, while the sum is 68.

The spelling of 1949281809089 in words is "one trillion, nine hundred forty-nine billion, two hundred eighty-one million, eight hundred nine thousand, eighty-nine".