223218425 has 12 divisors (see below), whose sum is σ = 277133676. Its totient is φ = 178353600.

The previous prime is 223218421. The next prime is 223218439. The reversal of 223218425 is 524812322.

It can be written as a sum of positive squares in 6 ways, for example, as 2042041 + 221176384 = 1429^2 + 14872^2 .

It is not a de Polignac number, because 223218425 - 2² = 223218421 is a prime.

It is a super-3 number, since 3×223218425³ (a number of 26 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (223218421) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 16835 + ... + 27015.

It is an arithmetic number, because the mean of its divisors is an integer number (23094473).

Almost surely, 2^223218425 is an apocalyptic number.

223218425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

223218425 is a deficient number, since it is larger than the sum of its proper divisors (53915251).

223218425 is a wasteful number, since it uses less digits than its factorization.

223218425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11068 (or 11063 counting only the distinct ones).

The product of its digits is 7680, while the sum is 29.

The square root of 223218425 is about 14940.4961430335. The cubic root of 223218425 is about 606.6106254168.

The spelling of 223218425 in words is "two hundred twenty-three million, two hundred eighteen thousand, four hundred twenty-five".