243741781 has 8 divisors (see below), whose sum is σ = 255340800. Its totient is φ = 232355760.

The previous prime is 243741737. The next prime is 243741811. The reversal of 243741781 is 187147342.

243741781 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-243741781 is a prime.

It is a super-2 number, since 2×243741781² = 118820111610103922, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 243741781.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243741181) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 50905 + ... + 55486.

It is an arithmetic number, because the mean of its divisors is an integer number (31917600).

Almost surely, 2^243741781 is an apocalyptic number.

It is an amenable number.

243741781 is a deficient number, since it is larger than the sum of its proper divisors (11599019).

243741781 is a wasteful number, since it uses less digits than its factorization.

243741781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106499.

The product of its digits is 37632, while the sum is 37.

The square root of 243741781 is about 15612.2317751179. The cubic root of 243741781 is about 624.6594676140.

The spelling of 243741781 in words is "two hundred forty-three million, seven hundred forty-one thousand, seven hundred eighty-one".