243042554 has 4 divisors (see below), whose sum is σ = 364563834. Its totient is φ = 121521276.

The previous prime is 243042551. The next prime is 243042563. The reversal of 243042554 is 455240342.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 200987329 + 42055225 = 14177^2 + 6485^2 .

It is not an unprimeable number, because it can be changed into a prime (243042551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60760637 + ... + 60760640.

Almost surely, 2^243042554 is an apocalyptic number.

243042554 is a deficient number, since it is larger than the sum of its proper divisors (121521280).

243042554 is a wasteful number, since it uses less digits than its factorization.

243042554 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121521279.

The product of its (nonzero) digits is 19200, while the sum is 29.

The square root of 243042554 is about 15589.8221285555. The cubic root of 243042554 is about 624.0615710804.

Adding to 243042554 its reverse (455240342), we get a palindrome (698282896).

The spelling of 243042554 in words is "two hundred forty-three million, forty-two thousand, five hundred fifty-four".