987598561 has 16 divisors (see below), whose sum is σ = 1076011344. Its totient is φ = 902651904.

The previous prime is 987598523. The next prime is 987598583. The reversal of 987598561 is 165895789.

It can be written as a sum of positive squares in 8 ways, for example, as 41667025 + 945931536 = 6455^2 + 30756^2 .

It is a cyclic number.

It is not a de Polignac number, because 987598561 - 2⁷ = 987598433 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 987598496 and 987598505.

It is not an unprimeable number, because it can be changed into a prime (987598061) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 422151 + ... + 424483.

It is an arithmetic number, because the mean of its divisors is an integer number (67250709).

Almost surely, 2^987598561 is an apocalyptic number.

It is an amenable number.

987598561 is a deficient number, since it is larger than the sum of its proper divisors (88412783).

987598561 is a wasteful number, since it uses less digits than its factorization.

987598561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3060.

The product of its digits is 5443200, while the sum is 58.

The square root of 987598561 is about 31426.0809042426. The cubic root of 987598561 is about 995.8489798739.

The spelling of 987598561 in words is "nine hundred eighty-seven million, five hundred ninety-eight thousand, five hundred sixty-one".