19121287079 has 2 divisors, whose sum is σ = 19121287080. Its totient is φ = 19121287078.

The previous prime is 19121287069. The next prime is 19121287117. The reversal of 19121287079 is 97078212191.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19121287079 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19121287039) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9560643539 + 9560643540.

It is an arithmetic number, because the mean of its divisors is an integer number (9560643540).

Almost surely, 2^19121287079 is an apocalyptic number.

19121287079 is a deficient number, since it is larger than the sum of its proper divisors (1).

19121287079 is an equidigital number, since it uses as much as digits as its factorization.

19121287079 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 127008, while the sum is 47.

The spelling of 19121287079 in words is "nineteen billion, one hundred twenty-one million, two hundred eighty-seven thousand, seventy-nine".