243863551 has 2 divisors, whose sum is σ = 243863552. Its totient is φ = 243863550.

The previous prime is 243863533. The next prime is 243863567. The reversal of 243863551 is 155368342.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 243863551 - 2⁵ = 243863519 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 243863551.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243863051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121931775 + 121931776.

It is an arithmetic number, because the mean of its divisors is an integer number (121931776).

Almost surely, 2^243863551 is an apocalyptic number.

243863551 is a deficient number, since it is larger than the sum of its proper divisors (1).

243863551 is an equidigital number, since it uses as much as digits as its factorization.

243863551 is an evil number, because the sum of its binary digits is even.

The product of its digits is 86400, while the sum is 37.

The square root of 243863551 is about 15616.1311149721. The cubic root of 243863551 is about 624.7634740200.

The spelling of 243863551 in words is "two hundred forty-three million, eight hundred sixty-three thousand, five hundred fifty-one".