989621429 has 2 divisors, whose sum is σ = 989621430. Its totient is φ = 989621428.

The previous prime is 989621417. The next prime is 989621431. The reversal of 989621429 is 924126989.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 950057329 + 39564100 = 30823^2 + 6290^2 .

It is an emirp because it is prime and its reverse (924126989) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 989621429 - 2⁸ = 989621173 is a prime.

Together with 989621431, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (989621449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 494810714 + 494810715.

It is an arithmetic number, because the mean of its divisors is an integer number (494810715).

Almost surely, 2^989621429 is an apocalyptic number.

It is an amenable number.

989621429 is a deficient number, since it is larger than the sum of its proper divisors (1).

989621429 is an equidigital number, since it uses as much as digits as its factorization.

989621429 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 559872, while the sum is 50.

The square root of 989621429 is about 31458.2489817854. The cubic root of 989621429 is about 996.5284385405.

The spelling of 989621429 in words is "nine hundred eighty-nine million, six hundred twenty-one thousand, four hundred twenty-nine".