91642 has 4 divisors (see below), whose sum is σ = 137466. Its totient is φ = 45820.

The previous prime is 91639. The next prime is 91673. The reversal of 91642 is 24619.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 24619 = 7 ⋅3517.

It can be written as a sum of positive squares in only one way, i.e., 47961 + 43681 = 219^2 + 209^2 .

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a plaindrome in base 14.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 22909 + ... + 22912.

2⁹¹⁶⁴² is an apocalyptic number.

91642 is a deficient number, since it is larger than the sum of its proper divisors (45824).

91642 is a wasteful number, since it uses less digits than its factorization.

It is an anagram of its base 11 representation: 91642 = (62941)₁₁.

91642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45823.

The product of its digits is 432, while the sum is 22.

The square root of 91642 is about 302.7242970097. The cubic root of 91642 is about 45.0849424416.

The spelling of 91642 in words is "ninety-one thousand, six hundred forty-two".