19131744617 has 2 divisors, whose sum is σ = 19131744618. Its totient is φ = 19131744616.

The previous prime is 19131744571. The next prime is 19131744629. The reversal of 19131744617 is 71644713191.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13960840336 + 5170904281 = 118156^2 + 71909^2 .

It is a cyclic number.

It is not a de Polignac number, because 19131744617 - 2¹² = 19131740521 is a prime.

It is not a weakly prime, because it can be changed into another prime (19131744217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9565872308 + 9565872309.

It is an arithmetic number, because the mean of its divisors is an integer number (9565872309).

Almost surely, 2^19131744617 is an apocalyptic number.

It is an amenable number.

19131744617 is a deficient number, since it is larger than the sum of its proper divisors (1).

19131744617 is an equidigital number, since it uses as much as digits as its factorization.

19131744617 is an evil number, because the sum of its binary digits is even.

The product of its digits is 127008, while the sum is 44.

The spelling of 19131744617 in words is "nineteen billion, one hundred thirty-one million, seven hundred forty-four thousand, six hundred seventeen".