223691 has 4 divisors (see below), whose sum is σ = 240912. Its totient is φ = 206472.

The previous prime is 223681. The next prime is 223697. The reversal of 223691 is 196322.

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 223691 - 2¹⁴ = 207307 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (223697) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8591 + ... + 8616.

It is an arithmetic number, because the mean of its divisors is an integer number (60228).

2²²³⁶⁹¹ is an apocalyptic number.

223691 is a deficient number, since it is larger than the sum of its proper divisors (17221).

223691 is a wasteful number, since it uses less digits than its factorization.

223691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17220.

The product of its digits is 648, while the sum is 23.

The square root of 223691 is about 472.9598291610. The cubic root of 223691 is about 60.7038408132.

The spelling of 223691 in words is "two hundred twenty-three thousand, six hundred ninety-one".