91623 has 8 divisors (see below), whose sum is σ = 139648. Its totient is φ = 52344.

The previous prime is 91621. The next prime is 91631. The reversal of 91623 is 32619.

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

It is not a de Polignac number, because 91623 - 2¹ = 91621 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21), and also a Moran number because the ratio is a prime number: 4363 = 91623 / (9 + 1 + 6 + 2 + 3).

It is a Duffinian number.

It is a plaindrome in base 14.

It is a self number, because there is not a number n which added to its sum of digits gives 91623.

It is a congruent number.

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, 2161 + ... + 2202.

It is an arithmetic number, because the mean of its divisors is an integer number (17456).

2⁹¹⁶²³ is an apocalyptic number.

91623 is a deficient number, since it is larger than the sum of its proper divisors (48025).

91623 is a wasteful number, since it uses less digits than its factorization.

91623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4373.

The product of its digits is 324, while the sum is 21.

The square root of 91623 is about 302.6929136931. The cubic root of 91623 is about 45.0818264281.

It can be divided in two parts, 916 and 23, that added together give a palindrome (939).

The spelling of 91623 in words is "ninety-one thousand, six hundred twenty-three".