98987509 has 4 divisors (see below), whose sum is σ = 99129420. Its totient is φ = 98845600.

The previous prime is 98987507. The next prime is 98987533. The reversal of 98987509 is 90578989.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 53802225 + 45185284 = 7335^2 + 6722^2 .

It is a cyclic number.

It is not a de Polignac number, because 98987509 - 2¹ = 98987507 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 98987509.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (98987501) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 69904 + ... + 71305.

It is an arithmetic number, because the mean of its divisors is an integer number (24782355).

Almost surely, 2^98987509 is an apocalyptic number.

It is an amenable number.

98987509 is a deficient number, since it is larger than the sum of its proper divisors (141911).

98987509 is a wasteful number, since it uses less digits than its factorization.

98987509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141910.

The product of its (nonzero) digits is 1632960, while the sum is 55.

The square root of 98987509 is about 9949.2466548980. The cubic root of 98987509 is about 462.5870441478.

The spelling of 98987509 in words is "ninety-eight million, nine hundred eighty-seven thousand, five hundred nine".