243726481 has 2 divisors, whose sum is σ = 243726482. Its totient is φ = 243726480.

The previous prime is 243726449. The next prime is 243726491. The reversal of 243726481 is 184627342.

243726481 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 230766481 + 12960000 = 15191^2 + 3600^2 .

It is a cyclic number.

It is not a de Polignac number, because 243726481 - 2⁵ = 243726449 is a prime.

It is a super-2 number, since 2×243726481² = 118805195081286722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 243726481.

It is not a weakly prime, because it can be changed into another prime (243726491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121863240 + 121863241.

It is an arithmetic number, because the mean of its divisors is an integer number (121863241).

Almost surely, 2^243726481 is an apocalyptic number.

It is an amenable number.

243726481 is a deficient number, since it is larger than the sum of its proper divisors (1).

243726481 is an equidigital number, since it uses as much as digits as its factorization.

243726481 is an evil number, because the sum of its binary digits is even.

The product of its digits is 64512, while the sum is 37.

The square root of 243726481 is about 15611.7417670163. The cubic root of 243726481 is about 624.6463971017.

The spelling of 243726481 in words is "two hundred forty-three million, seven hundred twenty-six thousand, four hundred eighty-one".