19945749113 has 2 divisors, whose sum is σ = 19945749114. Its totient is φ = 19945749112.

The previous prime is 19945749101. The next prime is 19945749121. The reversal of 19945749113 is 31194754991.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18975613504 + 970135609 = 137752^2 + 31147^2 .

It is an emirp because it is prime and its reverse (31194754991) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19945749113 is a prime.

It is not a weakly prime, because it can be changed into another prime (19945749143) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9972874556 + 9972874557.

It is an arithmetic number, because the mean of its divisors is an integer number (9972874557).

Almost surely, 2^19945749113 is an apocalyptic number.

It is an amenable number.

19945749113 is a deficient number, since it is larger than the sum of its proper divisors (1).

19945749113 is an equidigital number, since it uses as much as digits as its factorization.

19945749113 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1224720, while the sum is 53.

The spelling of 19945749113 in words is "nineteen billion, nine hundred forty-five million, seven hundred forty-nine thousand, one hundred thirteen".