223981 has 4 divisors (see below), whose sum is σ = 227392. Its totient is φ = 220572.

The previous prime is 223969. The next prime is 223999. The reversal of 223981 is 189322.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 223981 - 2⁹ = 223469 is a prime.

It is a super-2 number, since 2×223981² = 100334976722, which contains 22 as substring.

It is a Duffinian number.

It is a nialpdrome in base 12.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (223921) 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, 1605 + ... + 1738.

It is an arithmetic number, because the mean of its divisors is an integer number (56848).

2²²³⁹⁸¹ is an apocalyptic number.

It is an amenable number.

223981 is a deficient number, since it is larger than the sum of its proper divisors (3411).

223981 is an equidigital number, since it uses as much as digits as its factorization.

223981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3410.

The product of its digits is 864, while the sum is 25.

The square root of 223981 is about 473.2663098088. The cubic root of 223981 is about 60.7300622702.

The spelling of 223981 in words is "two hundred twenty-three thousand, nine hundred eighty-one".