89661509 has 8 divisors (see below), whose sum is σ = 103253568. Its totient is φ = 76265280.

The previous prime is 89661503. The next prime is 89661511. The reversal of 89661509 is 90516698.

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

It is not a de Polignac number, because 89661509 - 2¹⁶ = 89595973 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 89661509.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (89661503) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 47972 + ... + 49805.

It is an arithmetic number, because the mean of its divisors is an integer number (12906696).

Almost surely, 2^89661509 is an apocalyptic number.

It is an amenable number.

89661509 is a deficient number, since it is larger than the sum of its proper divisors (13592059).

89661509 is a wasteful number, since it uses less digits than its factorization.

89661509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97915.

The product of its (nonzero) digits is 116640, while the sum is 44.

The square root of 89661509 is about 9468.9761326133. The cubic root of 89661509 is about 447.5779484079.

The spelling of 89661509 in words is "eighty-nine million, six hundred sixty-one thousand, five hundred nine".