989126989 has 2 divisors, whose sum is σ = 989126990. Its totient is φ = 989126988.

The previous prime is 989126977. The next prime is 989126993. The reversal of 989126989 is 989621989.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 810370089 + 178756900 = 28467^2 + 13370^2 .

It is a cyclic number.

It is not a de Polignac number, because 989126989 - 2²⁷ = 854909261 is a prime.

It is a super-2 number, since 2×989126989² = 1956744400736412242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (989126959) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 494563494 + 494563495.

It is an arithmetic number, because the mean of its divisors is an integer number (494563495).

Almost surely, 2^989126989 is an apocalyptic number.

It is an amenable number.

989126989 is a deficient number, since it is larger than the sum of its proper divisors (1).

989126989 is an equidigital number, since it uses as much as digits as its factorization.

989126989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5038848, while the sum is 61.

The square root of 989126989 is about 31450.3893298636. The cubic root of 989126989 is about 996.3624472538.

The spelling of 989126989 in words is "nine hundred eighty-nine million, one hundred twenty-six thousand, nine hundred eighty-nine".