243279681 has 16 divisors (see below), whose sum is σ = 333189120. Its totient is φ = 157807440.

The previous prime is 243279677. The next prime is 243279697. The reversal of 243279681 is 186972342.

It is not a de Polignac number, because 243279681 - 2² = 243279677 is a prime.

It is a super-2 number, since 2×243279681² = 118370006374923522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (243277681) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31480 + ... + 38438.

It is an arithmetic number, because the mean of its divisors is an integer number (20824320).

Almost surely, 2^243279681 is an apocalyptic number.

It is an amenable number.

243279681 is a deficient number, since it is larger than the sum of its proper divisors (89909439).

243279681 is a wasteful number, since it uses less digits than its factorization.

243279681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7276.

The product of its digits is 145152, while the sum is 42.

The square root of 243279681 is about 15597.4254606329. The cubic root of 243279681 is about 624.2644625016.

The spelling of 243279681 in words is "two hundred forty-three million, two hundred seventy-nine thousand, six hundred eighty-one".