19631689379 has 2 divisors, whose sum is σ = 19631689380. Its totient is φ = 19631689378.

The previous prime is 19631689373. The next prime is 19631689381. The reversal of 19631689379 is 97398613691.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19631689379 is a prime.

Together with 19631689381, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (19631689373) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9815844689 + 9815844690.

It is an arithmetic number, because the mean of its divisors is an integer number (9815844690).

Almost surely, 2^19631689379 is an apocalyptic number.

19631689379 is a deficient number, since it is larger than the sum of its proper divisors (1).

19631689379 is an equidigital number, since it uses as much as digits as its factorization.

19631689379 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13226976, while the sum is 62.

The spelling of 19631689379 in words is "nineteen billion, six hundred thirty-one million, six hundred eighty-nine thousand, three hundred seventy-nine".