89660591 has 4 divisors (see below), whose sum is σ = 89680152. Its totient is φ = 89641032.

The previous prime is 89660581. The next prime is 89660617. The reversal of 89660591 is 19506698.

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

It is a cyclic number.

It is not a de Polignac number, because 89660591 - 2¹⁰ = 89659567 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (89660531) 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, 1220 + ... + 13446.

It is an arithmetic number, because the mean of its divisors is an integer number (22420038).

Almost surely, 2^89660591 is an apocalyptic number.

89660591 is a deficient number, since it is larger than the sum of its proper divisors (19561).

89660591 is a wasteful number, since it uses less digits than its factorization.

89660591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19560.

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

The square root of 89660591 is about 9468.9276583993. The cubic root of 89660591 is about 447.5764208926.

The spelling of 89660591 in words is "eighty-nine million, six hundred sixty thousand, five hundred ninety-one".