223961 has 4 divisors (see below), whose sum is σ = 230052. Its totient is φ = 217872.

The previous prime is 223939. The next prime is 223963. The reversal of 223961 is 169322.

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

It can be written as a sum of positive squares in 2 ways, for example, as 105625 + 118336 = 325^2 + 344^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-223961 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 8.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (223963) 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, 2990 + ... + 3063.

It is an arithmetic number, because the mean of its divisors is an integer number (57513).

2²²³⁹⁶¹ is an apocalyptic number.

It is an amenable number.

223961 is a deficient number, since it is larger than the sum of its proper divisors (6091).

223961 is an equidigital number, since it uses as much as digits as its factorization.

223961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6090.

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

The square root of 223961 is about 473.2451795845. The cubic root of 223961 is about 60.7282546207.

The spelling of 223961 in words is "two hundred twenty-three thousand, nine hundred sixty-one".