989622869 has 2 divisors, whose sum is σ = 989622870. Its totient is φ = 989622868.

The previous prime is 989622859. The next prime is 989622913. The reversal of 989622869 is 968226989.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 797384644 + 192238225 = 28238^2 + 13865^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-989622869 is a prime.

It is a super-2 number, since 2×989622869² = 1958706845695582322, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (989622859) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 494811434 + 494811435.

It is an arithmetic number, because the mean of its divisors is an integer number (494811435).

Almost surely, 2^989622869 is an apocalyptic number.

It is an amenable number.

989622869 is a deficient number, since it is larger than the sum of its proper divisors (1).

989622869 is an equidigital number, since it uses as much as digits as its factorization.

989622869 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6718464, while the sum is 59.

The square root of 989622869 is about 31458.2718692556. The cubic root of 989622869 is about 996.5289218904.

The spelling of 989622869 in words is "nine hundred eighty-nine million, six hundred twenty-two thousand, eight hundred sixty-nine".