224991 has 16 divisors (see below), whose sum is σ = 359520. Its totient is φ = 138240.

The previous prime is 224977. The next prime is 224993. The reversal of 224991 is 199422.

It is not a de Polignac number, because 224991 - 2⁷ = 224863 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 224991.

It is not an unprimeable number, because it can be changed into a prime (224993) 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, 31 + ... + 671.

It is an arithmetic number, because the mean of its divisors is an integer number (22470).

2²²⁴⁹⁹¹ is an apocalyptic number.

224991 is a deficient number, since it is larger than the sum of its proper divisors (134529).

224991 is a wasteful number, since it uses less digits than its factorization.

224991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 663 (or 657 counting only the distinct ones).

The product of its digits is 1296, while the sum is 27.

The square root of 224991 is about 474.3321620974. The cubic root of 224991 is about 60.8212089847.

It can be divided in two parts, 22499 and 1, that added together give a square (22500 = 150²).

The spelling of 224991 in words is "two hundred twenty-four thousand, nine hundred ninety-one".