19709241491 has 2 divisors, whose sum is σ = 19709241492. Its totient is φ = 19709241490.

The previous prime is 19709241469. The next prime is 19709241509. The reversal of 19709241491 is 19414290791.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 19709241491 - 2³⁰ = 18635499667 is a prime.

It is not a weakly prime, because it can be changed into another prime (19709241421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9854620745 + 9854620746.

It is an arithmetic number, because the mean of its divisors is an integer number (9854620746).

Almost surely, 2^19709241491 is an apocalyptic number.

19709241491 is a deficient number, since it is larger than the sum of its proper divisors (1).

19709241491 is an equidigital number, since it uses as much as digits as its factorization.

19709241491 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 163296, while the sum is 47.

The spelling of 19709241491 in words is "nineteen billion, seven hundred nine million, two hundred forty-one thousand, four hundred ninety-one".