243550639 has 2 divisors, whose sum is σ = 243550640. Its totient is φ = 243550638.

The previous prime is 243550603. The next prime is 243550651. The reversal of 243550639 is 936055342.

243550639 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 is a cyclic number.

It is not a de Polignac number, because 243550639 - 2¹³ = 243542447 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 243550598 and 243550607.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243550669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121775319 + 121775320.

It is an arithmetic number, because the mean of its divisors is an integer number (121775320).

Almost surely, 2^243550639 is an apocalyptic number.

243550639 is a deficient number, since it is larger than the sum of its proper divisors (1).

243550639 is an equidigital number, since it uses as much as digits as its factorization.

243550639 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 97200, while the sum is 37.

The square root of 243550639 is about 15606.1090281979. The cubic root of 243550639 is about 624.4961391880.

The spelling of 243550639 in words is "two hundred forty-three million, five hundred fifty thousand, six hundred thirty-nine".