243224551 has 2 divisors, whose sum is σ = 243224552. Its totient is φ = 243224550.

The previous prime is 243224519. The next prime is 243224573. The reversal of 243224551 is 155422342.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 243224551 - 2⁵ = 243224519 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243224581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121612275 + 121612276.

It is an arithmetic number, because the mean of its divisors is an integer number (121612276).

Almost surely, 2^243224551 is an apocalyptic number.

243224551 is a deficient number, since it is larger than the sum of its proper divisors (1).

243224551 is an equidigital number, since it uses as much as digits as its factorization.

243224551 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9600, while the sum is 28.

The square root of 243224551 is about 15595.6580816585. The cubic root of 243224551 is about 624.2173037477.

Adding to 243224551 its reverse (155422342), we get a palindrome (398646893).

The spelling of 243224551 in words is "two hundred forty-three million, two hundred twenty-four thousand, five hundred fifty-one".