243991226 has 4 divisors (see below), whose sum is σ = 365986842. Its totient is φ = 121995612.

The previous prime is 243991207. The next prime is 243991243. The reversal of 243991226 is 622199342.

It is a happy number.

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., 161163025 + 82828201 = 12695^2 + 9101^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 243991226.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 60997805 + ... + 60997808.

Almost surely, 2^243991226 is an apocalyptic number.

243991226 is a deficient number, since it is larger than the sum of its proper divisors (121995616).

243991226 is a wasteful number, since it uses less digits than its factorization.

243991226 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121995615.

The product of its digits is 46656, while the sum is 38.

The square root of 243991226 is about 15620.2185003924. The cubic root of 243991226 is about 624.8724868397.

The spelling of 243991226 in words is "two hundred forty-three million, nine hundred ninety-one thousand, two hundred twenty-six".