100491 has 16 divisors (see below), whose sum is σ = 147840. Its totient is φ = 60480.

The previous prime is 100483. The next prime is 100493. The reversal of 100491 is 194001.

100491 is an esthetic number in base 7, because in such base its adjacent digits differ by 1.

It is not a de Polignac number, because 100491 - 2³ = 100483 is a prime.

100491 is an undulating number in base 7.

It is a plaindrome in base 14 and base 16.

It is a self number, because there is not a number n which added to its sum of digits gives 100491.

It is not an unprimeable number, because it can be changed into a prime (100493) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2316 + ... + 2358.

It is an arithmetic number, because the mean of its divisors is an integer number (9240).

2¹⁰⁰⁴⁹¹ is an apocalyptic number.

100491 is a deficient number, since it is larger than the sum of its proper divisors (47349).

100491 is a wasteful number, since it uses less digits than its factorization.

100491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106.

The product of its (nonzero) digits is 36, while the sum is 15.

The square root of 100491 is about 317.0031545584. The cubic root of 100491 is about 46.4917316782.

Adding to 100491 its reverse (194001), we get a palindrome (294492).

The spelling of 100491 in words is "one hundred thousand, four hundred ninety-one".