19001328949 has 2 divisors, whose sum is σ = 19001328950. Its totient is φ = 19001328948.

The previous prime is 19001328923. The next prime is 19001328959. The reversal of 19001328949 is 94982310091.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18699195025 + 302133924 = 136745^2 + 17382^2 .

It is an emirp because it is prime and its reverse (94982310091) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19001328949 is a prime.

It is a super-2 number, since 2×19001328949² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 19001328899 and 19001328908.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19001328959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9500664474 + 9500664475.

It is an arithmetic number, because the mean of its divisors is an integer number (9500664475).

Almost surely, 2^19001328949 is an apocalyptic number.

It is an amenable number.

19001328949 is a deficient number, since it is larger than the sum of its proper divisors (1).

19001328949 is an equidigital number, since it uses as much as digits as its factorization.

19001328949 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 139968, while the sum is 46.

The spelling of 19001328949 in words is "nineteen billion, one million, three hundred twenty-eight thousand, nine hundred forty-nine".