223640533 has 2 divisors, whose sum is σ = 223640534. Its totient is φ = 223640532.

The previous prime is 223640531. The next prime is 223640551. The reversal of 223640533 is 335046322.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 218359729 + 5280804 = 14777^2 + 2298^2 .

It is a cyclic number.

It is not a de Polignac number, because 223640533 - 2¹ = 223640531 is a prime.

Together with 223640531, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (223640531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 111820266 + 111820267.

It is an arithmetic number, because the mean of its divisors is an integer number (111820267).

Almost surely, 2^223640533 is an apocalyptic number.

It is an amenable number.

223640533 is a deficient number, since it is larger than the sum of its proper divisors (1).

223640533 is an equidigital number, since it uses as much as digits as its factorization.

223640533 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12960, while the sum is 28.

The square root of 223640533 is about 14954.6157757396. The cubic root of 223640533 is about 606.9927533203.

Adding to 223640533 its reverse (335046322), we get a palindrome (558686855).

The spelling of 223640533 in words is "two hundred twenty-three million, six hundred forty thousand, five hundred thirty-three".