243795649 has 2 divisors, whose sum is σ = 243795650. Its totient is φ = 243795648.

The previous prime is 243795583. The next prime is 243795661. The reversal of 243795649 is 946597342.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 160402225 + 83393424 = 12665^2 + 9132^2 .

It is a cyclic number.

It is not a de Polignac number, because 243795649 - 2¹⁹ = 243271361 is a prime.

It is a super-3 number, since 3×243795649³ (a number of 26 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (243795679) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121897824 + 121897825.

It is an arithmetic number, because the mean of its divisors is an integer number (121897825).

Almost surely, 2^243795649 is an apocalyptic number.

It is an amenable number.

243795649 is a deficient number, since it is larger than the sum of its proper divisors (1).

243795649 is an equidigital number, since it uses as much as digits as its factorization.

243795649 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1632960, while the sum is 49.

The square root of 243795649 is about 15613.9568655738. The cubic root of 243795649 is about 624.7054817162.

The spelling of 243795649 in words is "two hundred forty-three million, seven hundred ninety-five thousand, six hundred forty-nine".