19051312649 has 2 divisors, whose sum is σ = 19051312650. Its totient is φ = 19051312648.

The previous prime is 19051312639. The next prime is 19051312681. The reversal of 19051312649 is 94621315091.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10310371600 + 8740941049 = 101540^2 + 93493^2 .

It is an emirp because it is prime and its reverse (94621315091) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 19051312649 - 2³² = 14756345353 is a prime.

It is not a weakly prime, because it can be changed into another prime (19051312639) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9525656324 + 9525656325.

It is an arithmetic number, because the mean of its divisors is an integer number (9525656325).

Almost surely, 2^19051312649 is an apocalyptic number.

It is an amenable number.

19051312649 is a deficient number, since it is larger than the sum of its proper divisors (1).

19051312649 is an equidigital number, since it uses as much as digits as its factorization.

19051312649 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 58320, while the sum is 41.

The spelling of 19051312649 in words is "nineteen billion, fifty-one million, three hundred twelve thousand, six hundred forty-nine".