243761563 has 2 divisors, whose sum is σ = 243761564. Its totient is φ = 243761562.

The previous prime is 243761561. The next prime is 243761579. The reversal of 243761563 is 365167342.

243761563 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 243761563 - 2¹ = 243761561 is a prime.

Together with 243761561, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (243761561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121880781 + 121880782.

It is an arithmetic number, because the mean of its divisors is an integer number (121880782).

Almost surely, 2^243761563 is an apocalyptic number.

243761563 is a deficient number, since it is larger than the sum of its proper divisors (1).

243761563 is an equidigital number, since it uses as much as digits as its factorization.

243761563 is an evil number, because the sum of its binary digits is even.

The product of its digits is 90720, while the sum is 37.

The square root of 243761563 is about 15612.8653039729. The cubic root of 243761563 is about 624.6763662068.

It can be divided in two parts, 2437 and 61563, that added together give a cube (64000 = 40³).

The spelling of 243761563 in words is "two hundred forty-three million, seven hundred sixty-one thousand, five hundred sixty-three".