243550138 has 16 divisors (see below), whose sum is σ = 393823080. Its totient is φ = 112294656.

The previous prime is 243550133. The next prime is 243550141. The reversal of 243550138 is 831055342.

243550138 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 190798969 + 52751169 = 13813^2 + 7263^2 .

It is a super-3 number, since 3×243550138³ (a number of 26 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (243550133) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25206 + ... + 33502.

Almost surely, 2^243550138 is an apocalyptic number.

243550138 is a deficient number, since it is larger than the sum of its proper divisors (150272942).

243550138 is a wasteful number, since it uses less digits than its factorization.

243550138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9441.

The product of its (nonzero) digits is 14400, while the sum is 31.

The square root of 243550138 is about 15606.0929767831. The cubic root of 243550138 is about 624.4957109776.

The spelling of 243550138 in words is "two hundred forty-three million, five hundred fifty thousand, one hundred thirty-eight".