89691 has 8 divisors (see below), whose sum is σ = 136704. Its totient is φ = 51240.

The previous prime is 89689. The next prime is 89753. The reversal of 89691 is 19698.

It is a happy number.

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

It is not a de Polignac number, because 89691 - 2¹ = 89689 is a prime.

It is not an unprimeable number, because it can be changed into a prime (89611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2115 + ... + 2156.

It is an arithmetic number, because the mean of its divisors is an integer number (17088).

2⁸⁹⁶⁹¹ is an apocalyptic number.

89691 is a deficient number, since it is larger than the sum of its proper divisors (47013).

89691 is a wasteful number, since it uses less digits than its factorization.

89691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4281.

The product of its digits is 3888, while the sum is 33.

The square root of 89691 is about 299.4845571979. The cubic root of 89691 is about 44.7627014704.

It can be divided in two parts, 89 and 691, that added together give a triangular number (780 = T₃₉).

The spelling of 89691 in words is "eighty-nine thousand, six hundred ninety-one".