243240505501 has 12 divisors (see below), whose sum is σ = 283342489248. Its totient is φ = 208205047512.

The previous prime is 243240505483. The next prime is 243240505579. The reversal of 243240505501 is 105505042342.

It is not a de Polignac number, because 243240505501 - 2¹⁵ = 243240472733 is a prime.

It is a super-2 number, since 2×243240505501² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243240505601) 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, 3378471 + ... + 3449716.

It is an arithmetic number, because the mean of its divisors is an integer number (23611874104).

Almost surely, 2^243240505501 is an apocalyptic number.

It is an amenable number.

243240505501 is a deficient number, since it is larger than the sum of its proper divisors (40101983747).

243240505501 is an equidigital number, since it uses as much as digits as its factorization.

243240505501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6828928 (or 6828921 counting only the distinct ones).

The product of its (nonzero) digits is 24000, while the sum is 31.

Adding to 243240505501 its reverse (105505042342), we get a palindrome (348745547843).

The spelling of 243240505501 in words is "two hundred forty-three billion, two hundred forty million, five hundred five thousand, five hundred one".