989523174869 has 2 divisors, whose sum is σ = 989523174870. Its totient is φ = 989523174868.

The previous prime is 989523174847. The next prime is 989523174943. The reversal of 989523174869 is 968471325989.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 983591864644 + 5931310225 = 991762^2 + 77015^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-989523174869 is a prime.

It is a super-2 number, since 2×989523174869² (a number of 25 digits) 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 (989523474869) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 494761587434 + 494761587435.

It is an arithmetic number, because the mean of its divisors is an integer number (494761587435).

Almost surely, 2^989523174869 is an apocalyptic number.

It is an amenable number.

989523174869 is a deficient number, since it is larger than the sum of its proper divisors (1).

989523174869 is an equidigital number, since it uses as much as digits as its factorization.

989523174869 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 235146240, while the sum is 71.

The spelling of 989523174869 in words is "nine hundred eighty-nine billion, five hundred twenty-three million, one hundred seventy-four thousand, eight hundred sixty-nine".