223491 has 16 divisors (see below), whose sum is σ = 322560. Its totient is φ = 137280.

The previous prime is 223481. The next prime is 223493. The reversal of 223491 is 194322.

It is not a de Polignac number, because 223491 - 2⁹ = 222979 is a prime.

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (223493) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2790 + ... + 2868.

It is an arithmetic number, because the mean of its divisors is an integer number (20160).

2²²³⁴⁹¹ is an apocalyptic number.

223491 is a deficient number, since it is larger than the sum of its proper divisors (99069).

223491 is a wasteful number, since it uses less digits than its factorization.

223491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146.

The product of its digits is 432, while the sum is 21.

The square root of 223491 is about 472.7483474323. The cubic root of 223491 is about 60.6857438427.

The spelling of 223491 in words is "two hundred twenty-three thousand, four hundred ninety-one".