91673 has 2 divisors, whose sum is σ = 91674. Its totient is φ = 91672.

The previous prime is 91639. The next prime is 91691. The reversal of 91673 is 37619.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 73984 + 17689 = 272^2 + 133^2 .

It is an emirp because it is prime and its reverse (37619) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 91673 - 2¹⁴ = 75289 is a prime.

It is not a weakly prime, because it can be changed into another prime (91373) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45836 + 45837.

It is an arithmetic number, because the mean of its divisors is an integer number (45837).

2⁹¹⁶⁷³ is an apocalyptic number.

It is an amenable number.

91673 is a deficient number, since it is larger than the sum of its proper divisors (1).

91673 is an equidigital number, since it uses as much as digits as its factorization.

91673 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1134, while the sum is 26.

The square root of 91673 is about 302.7754943849. The cubic root of 91673 is about 45.0900255390.

It can be divided in two parts, 916 and 73, that added together give a palindrome (989).

The spelling of 91673 in words is "ninety-one thousand, six hundred seventy-three".