19942835249 has 2 divisors, whose sum is σ = 19942835250. Its totient is φ = 19942835248.

The previous prime is 19942835191. The next prime is 19942835261. The reversal of 19942835249 is 94253824991.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10033628224 + 9909207025 = 100168^2 + 99545^2 .

It is an emirp because it is prime and its reverse (94253824991) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 19942835249 - 2¹⁶ = 19942769713 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 19942835194 and 19942835203.

It is not a weakly prime, because it can be changed into another prime (19942835299) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9971417624 + 9971417625.

It is an arithmetic number, because the mean of its divisors is an integer number (9971417625).

Almost surely, 2^19942835249 is an apocalyptic number.

It is an amenable number.

19942835249 is a deficient number, since it is larger than the sum of its proper divisors (1).

19942835249 is an equidigital number, since it uses as much as digits as its factorization.

19942835249 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5598720, while the sum is 56.

The spelling of 19942835249 in words is "nineteen billion, nine hundred forty-two million, eight hundred thirty-five thousand, two hundred forty-nine".