989668019 has 2 divisors, whose sum is σ = 989668020. Its totient is φ = 989668018.

The previous prime is 989667967. The next prime is 989668021. The reversal of 989668019 is 910866989.

It is a strong prime.

It is an emirp because it is prime and its reverse (910866989) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 989668019 - 2¹² = 989663923 is a prime.

It is a super-2 number, since 2×989668019² = 1958885575662768722, which contains 22 as substring.

Together with 989668021, 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 (989668319) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 494834009 + 494834010.

It is an arithmetic number, because the mean of its divisors is an integer number (494834010).

Almost surely, 2^989668019 is an apocalyptic number.

989668019 is a deficient number, since it is larger than the sum of its proper divisors (1).

989668019 is an equidigital number, since it uses as much as digits as its factorization.

989668019 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1679616, while the sum is 56.

The square root of 989668019 is about 31458.9894783669. The cubic root of 989668019 is about 996.5440766859.

The spelling of 989668019 in words is "nine hundred eighty-nine million, six hundred sixty-eight thousand, nineteen".