19631689361 has 2 divisors, whose sum is σ = 19631689362. Its totient is φ = 19631689360.

The previous prime is 19631689339. The next prime is 19631689373. The reversal of 19631689361 is 16398613691.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15732935761 + 3898753600 = 125431^2 + 62440^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19631689361 is a prime.

It is not a weakly prime, because it can be changed into another prime (19631689321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9815844680 + 9815844681.

It is an arithmetic number, because the mean of its divisors is an integer number (9815844681).

Almost surely, 2^19631689361 is an apocalyptic number.

It is an amenable number.

19631689361 is a deficient number, since it is larger than the sum of its proper divisors (1).

19631689361 is an equidigital number, since it uses as much as digits as its factorization.

19631689361 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1259712, while the sum is 53.

The spelling of 19631689361 in words is "nineteen billion, six hundred thirty-one million, six hundred eighty-nine thousand, three hundred sixty-one".