243540601 has 2 divisors, whose sum is σ = 243540602. Its totient is φ = 243540600.

The previous prime is 243540587. The next prime is 243540611. The reversal of 243540601 is 106045342.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 203091001 + 40449600 = 14251^2 + 6360^2 .

It is a cyclic number.

It is not a de Polignac number, because 243540601 - 2⁵ = 243540569 is a prime.

It is a super-3 number, since 3×243540601³ (a number of 26 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (243540611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121770300 + 121770301.

It is an arithmetic number, because the mean of its divisors is an integer number (121770301).

Almost surely, 2^243540601 is an apocalyptic number.

It is an amenable number.

243540601 is a deficient number, since it is larger than the sum of its proper divisors (1).

243540601 is an equidigital number, since it uses as much as digits as its factorization.

243540601 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 243540601 is about 15605.7874200567. The cubic root of 243540601 is about 624.4875594824.

Adding to 243540601 its reverse (106045342), we get a palindrome (349585943).

The spelling of 243540601 in words is "two hundred forty-three million, five hundred forty thousand, six hundred one".