243040431501 has 64 divisors (see below), whose sum is σ = 412771645440. Its totient is φ = 138450850560.

The previous prime is 243040431493. The next prime is 243040431511. The reversal of 243040431501 is 105134040342.

It is a happy number.

243040431501 is a `hidden beast` number, since 2 + 430 + 40 + 43 + 150 + 1 = 666.

It is not a de Polignac number, because 243040431501 - 2³ = 243040431493 is a prime.

It is a super-2 number, since 2×243040431501² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243040431511) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 125861506 + ... + 125863436.

It is an arithmetic number, because the mean of its divisors is an integer number (6449556960).

Almost surely, 2^243040431501 is an apocalyptic number.

243040431501 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

243040431501 is a deficient number, since it is larger than the sum of its proper divisors (169731213939).

243040431501 is a wasteful number, since it uses less digits than its factorization.

243040431501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3663 (or 3657 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 27.

Adding to 243040431501 its reverse (105134040342), we get a palindrome (348174471843).

It can be divided in two parts, 243040 and 431501, that added together give a triangular number (674541 = T₁₁₆₁).

The spelling of 243040431501 in words is "two hundred forty-three billion, forty million, four hundred thirty-one thousand, five hundred one".