91641 has 8 divisors (see below), whose sum is σ = 133344. Its totient is φ = 55520.

The previous prime is 91639. The next prime is 91673. The reversal of 91641 is 14619.

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 91641 - 2¹ = 91639 is a prime.

It is a Curzon number.

It is a plaindrome in base 14.

It is not an unprimeable number, because it can be changed into a prime (91621) 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, 1356 + ... + 1421.

It is an arithmetic number, because the mean of its divisors is an integer number (16668).

2⁹¹⁶⁴¹ is an apocalyptic number.

It is an amenable number.

91641 is a deficient number, since it is larger than the sum of its proper divisors (41703).

91641 is a wasteful number, since it uses less digits than its factorization.

91641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2791.

The product of its digits is 216, while the sum is 21.

The square root of 91641 is about 302.7226453373. The cubic root of 91641 is about 45.0847784516.

The spelling of 91641 in words is "ninety-one thousand, six hundred forty-one".