98591509 has 2 divisors, whose sum is σ = 98591510. Its totient is φ = 98591508.

The previous prime is 98591491. The next prime is 98591531. The reversal of 98591509 is 90519589.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 91584900 + 7006609 = 9570^2 + 2647^2 .

It is an emirp because it is prime and its reverse (90519589) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 98591509 - 2²¹ = 96494357 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (98591579) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49295754 + 49295755.

It is an arithmetic number, because the mean of its divisors is an integer number (49295755).

Almost surely, 2^98591509 is an apocalyptic number.

It is an amenable number.

98591509 is a deficient number, since it is larger than the sum of its proper divisors (1).

98591509 is an equidigital number, since it uses as much as digits as its factorization.

98591509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 145800, while the sum is 46.

The square root of 98591509 is about 9929.3257072170. The cubic root of 98591509 is about 461.9693591743.

The spelling of 98591509 in words is "ninety-eight million, five hundred ninety-one thousand, five hundred nine".