243641457 has 6 divisors (see below), whose sum is σ = 351926562. Its totient is φ = 162427632.

The previous prime is 243641449. The next prime is 243641459. The reversal of 243641457 is 754146342.

243641457 is a `hidden beast` number, since 2 + 4 + 3 + 641 + 4 + 5 + 7 = 666.

243641457 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 243640881 + 576 = 15609^2 + 24^2 .

It is not a de Polignac number, because 243641457 - 2³ = 243641449 is a prime.

It is a super-2 number, since 2×243641457² = 118722319138165698, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (243641459) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 13535628 + ... + 13535645.

It is an arithmetic number, because the mean of its divisors is an integer number (58654427).

Almost surely, 2^243641457 is an apocalyptic number.

It is an amenable number.

243641457 is a deficient number, since it is larger than the sum of its proper divisors (108285105).

243641457 is a wasteful number, since it uses less digits than its factorization.

243641457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27071279 (or 27071276 counting only the distinct ones).

The product of its digits is 80640, while the sum is 36.

The square root of 243641457 is about 15609.0184508828. The cubic root of 243641457 is about 624.5737526739.

Adding to 243641457 its reverse (754146342), we get a palindrome (997787799).

The spelling of 243641457 in words is "two hundred forty-three million, six hundred forty-one thousand, four hundred fifty-seven".