102091 has 4 divisors (see below), whose sum is σ = 111384. Its totient is φ = 92800.

The previous prime is 102079. The next prime is 102101. The reversal of 102091 is 190201.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 190201 = 11 ⋅17291.

It is a cyclic number.

It is not a de Polignac number, because 102091 - 2⁵ = 102059 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (102001) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4630 + ... + 4651.

It is an arithmetic number, because the mean of its divisors is an integer number (27846).

2¹⁰²⁰⁹¹ is an apocalyptic number.

102091 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

102091 is a deficient number, since it is larger than the sum of its proper divisors (9293).

102091 is an equidigital number, since it uses as much as digits as its factorization.

102091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9292.

The product of its (nonzero) digits is 18, while the sum is 13.

The square root of 102091 is about 319.5168227183. The cubic root of 102091 is about 46.7371779873.

Adding to 102091 its reverse (190201), we get a palindrome (292292).

It can be divided in two parts, 1020 and 91, that added together give a palindrome (1111).

The spelling of 102091 in words is "one hundred two thousand, ninety-one".