242191 has 4 divisors (see below), whose sum is σ = 247392. Its totient is φ = 236992.

The previous prime is 242173. The next prime is 242197. The reversal of 242191 is 191242.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 191242 = 2 ⋅95621.

It is a cyclic number.

It is not a de Polignac number, because 242191 - 2⁹ = 241679 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (242197) 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, 2530 + ... + 2623.

It is an arithmetic number, because the mean of its divisors is an integer number (61848).

2²⁴²¹⁹¹ is an apocalyptic number.

242191 is a deficient number, since it is larger than the sum of its proper divisors (5201).

242191 is an equidigital number, since it uses as much as digits as its factorization.

242191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5200.

The product of its digits is 144, while the sum is 19.

The square root of 242191 is about 492.1290481164. The cubic root of 242191 is about 62.3331871718. Note that the first 3 decimals are identical.

The spelling of 242191 in words is "two hundred forty-two thousand, one hundred ninety-one".