920191 has 4 divisors (see below), whose sum is σ = 923032. Its totient is φ = 917352.

The previous prime is 920167. The next prime is 920197. The reversal of 920191 is 191029.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 920191 - 2⁹ = 919679 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (920197) 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, 861 + ... + 1606.

It is an arithmetic number, because the mean of its divisors is an integer number (230758).

2⁹²⁰¹⁹¹ is an apocalyptic number.

920191 is a deficient number, since it is larger than the sum of its proper divisors (2841).

920191 is a wasteful number, since it uses less digits than its factorization.

920191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2840.

The product of its (nonzero) digits is 162, while the sum is 22.

The square root of 920191 is about 959.2658651281. The cubic root of 920191 is about 97.2656127527.

Multiplying 920191 by its sum of digits (22), we get a palindrome (20244202).

Subtracting from 920191 its product of nonzero digits (162), we obtain a palindrome (920029).

It can be divided in two parts, 920 and 191, that added together give a palindrome (1111).

The spelling of 920191 in words is "nine hundred twenty thousand, one hundred ninety-one".