243081290 has 16 divisors (see below), whose sum is σ = 437725512. Its totient is φ = 97192704.

The previous prime is 243081287. The next prime is 243081299. The reversal of 243081290 is 92180342.

It can be written as a sum of positive squares in 4 ways, for example, as 147452449 + 95628841 = 12143^2 + 9779^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (243081299) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40142 + ... + 45798.

Almost surely, 2^243081290 is an apocalyptic number.

243081290 is a deficient number, since it is larger than the sum of its proper divisors (194644222).

243081290 is a wasteful number, since it uses less digits than its factorization.

243081290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9961.

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 243081290 is about 15591.0644280626. The cubic root of 243081290 is about 624.0947235256.

The spelling of 243081290 in words is "two hundred forty-three million, eighty-one thousand, two hundred ninety".