989509597 has 2 divisors, whose sum is σ = 989509598. Its totient is φ = 989509596.

The previous prime is 989509589. The next prime is 989509601. The reversal of 989509597 is 795905989.

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., 900660121 + 88849476 = 30011^2 + 9426^2 .

It is an emirp because it is prime and its reverse (795905989) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 989509597 - 2³ = 989509589 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (989509517) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 494754798 + 494754799.

It is an arithmetic number, because the mean of its divisors is an integer number (494754799).

Almost surely, 2^989509597 is an apocalyptic number.

It is an amenable number.

989509597 is a deficient number, since it is larger than the sum of its proper divisors (1).

989509597 is an equidigital number, since it uses as much as digits as its factorization.

989509597 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9185400, while the sum is 61.

The square root of 989509597 is about 31456.4714645492. The cubic root of 989509597 is about 996.4908996179.

The spelling of 989509597 in words is "nine hundred eighty-nine million, five hundred nine thousand, five hundred ninety-seven".