242691 has 4 divisors (see below), whose sum is σ = 323592. Its totient is φ = 161792.

The previous prime is 242689. The next prime is 242713. The reversal of 242691 is 196242.

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 242691 - 2¹ = 242689 is a prime.

It is an Ulam number.

It is a D-number.

It is a nialpdrome in base 12.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 242691.

It is not an unprimeable number, because it can be changed into a prime (242621) 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, 40446 + ... + 40451.

It is an arithmetic number, because the mean of its divisors is an integer number (80898).

2²⁴²⁶⁹¹ is an apocalyptic number.

242691 is a deficient number, since it is larger than the sum of its proper divisors (80901).

242691 is an equidigital number, since it uses as much as digits as its factorization.

242691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80900.

The product of its digits is 864, while the sum is 24.

The square root of 242691 is about 492.6367830359. The cubic root of 242691 is about 62.3760530235.

The spelling of 242691 in words is "two hundred forty-two thousand, six hundred ninety-one".