243806481 has 12 divisors (see below), whose sum is σ = 353413008. Its totient is φ = 161961624.

The previous prime is 243806471. The next prime is 243806489. The reversal of 243806481 is 184608342.

243806481 is a `hidden beast` number, since 2 + 4 + 3 + 8 + 0 + 648 + 1 = 666.

It is not a de Polignac number, because 243806481 - 2⁵ = 243806449 is a prime.

It is a super-2 number, since 2×243806481² = 118883200355206722, which contains 22 as substring.

It is a Curzon number.

It is a nialpdrome in base 16.

It is not an unprimeable number, because it can be changed into a prime (243806489) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 45315 + ... + 50408.

It is an arithmetic number, because the mean of its divisors is an integer number (29451084).

Almost surely, 2^243806481 is an apocalyptic number.

It is an amenable number.

243806481 is a deficient number, since it is larger than the sum of its proper divisors (109606527).

243806481 is a wasteful number, since it uses less digits than its factorization.

243806481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96012 (or 96009 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 36.

The square root of 243806481 is about 15614.3037308745. The cubic root of 243806481 is about 624.7147336034.

The spelling of 243806481 in words is "two hundred forty-three million, eight hundred six thousand, four hundred eighty-one".