190091 has 6 divisors (see below), whose sum is σ = 209076. Its totient is φ = 172700.

The previous prime is 190063. The next prime is 190093.

190091 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 190091 - 2⁶ = 190027 is a prime.

It is a super-2 number, since 2×190091² = 72269176562, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (190093) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 665 + ... + 906.

It is an arithmetic number, because the mean of its divisors is an integer number (34846).

2¹⁹⁰⁰⁹¹ is an apocalyptic number.

190091 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

190091 is a deficient number, since it is larger than the sum of its proper divisors (18985).

190091 is a wasteful number, since it uses less digits than its factorization.

190091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1593 (or 1582 counting only the distinct ones).

The product of its (nonzero) digits is 81, while the sum is 20.

The square root of 190091 is about 435.9942660173. The cubic root of 190091 is about 57.4981473883.

It can be divided in two parts, 1900 and 91, that added together give a palindrome (1991).

The spelling of 190091 in words is "one hundred ninety thousand, ninety-one".