243145316501 has 4 divisors (see below), whose sum is σ = 243157373004. Its totient is φ = 243133260000.

The previous prime is 243145316497. The next prime is 243145316503. The reversal of 243145316501 is 105613541342.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 49368396100 + 193776920401 = 222190^2 + 440201^2 .

It is a cyclic number.

It is not a de Polignac number, because 243145316501 - 2² = 243145316497 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243145316503) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5997950 + ... + 6038351.

It is an arithmetic number, because the mean of its divisors is an integer number (60789343251).

Almost surely, 2^243145316501 is an apocalyptic number.

It is an amenable number.

243145316501 is a deficient number, since it is larger than the sum of its proper divisors (12056503).

243145316501 is a wasteful number, since it uses less digits than its factorization.

243145316501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12056502.

The product of its (nonzero) digits is 43200, while the sum is 35.

Adding to 243145316501 its reverse (105613541342), we get a palindrome (348758857843).

The spelling of 243145316501 in words is "two hundred forty-three billion, one hundred forty-five million, three hundred sixteen thousand, five hundred one".