99961589 has 8 divisors (see below), whose sum is σ = 123029760. Its totient is φ = 79090416.

The previous prime is 99961571. The next prime is 99961591. The reversal of 99961589 is 98516999.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 99961589 - 2⁸ = 99961333 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99961559) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 549149 + ... + 549330.

It is an arithmetic number, because the mean of its divisors is an integer number (15378720).

Almost surely, 2^99961589 is an apocalyptic number.

It is an amenable number.

99961589 is a deficient number, since it is larger than the sum of its proper divisors (23068171).

99961589 is a wasteful number, since it uses less digits than its factorization.

99961589 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1098499.

The product of its digits is 1574640, while the sum is 56.

The square root of 99961589 is about 9998.0792655390. The cubic root of 99961589 is about 464.0994463943.

The spelling of 99961589 in words is "ninety-nine million, nine hundred sixty-one thousand, five hundred eighty-nine".