243040850537 has 4 divisors (see below), whose sum is σ = 243131102340. Its totient is φ = 242950598736.

The previous prime is 243040850501. The next prime is 243040850539. The reversal of 243040850537 is 735058040342.

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 59346319321 + 183694531216 = 243611^2 + 428596^2 .

It is a cyclic number.

It is not a de Polignac number, because 243040850537 - 2²⁴ = 243024073321 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 243040850494 and 243040850503.

It is not an unprimeable number, because it can be changed into a prime (243040850539) 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, 45121862 + ... + 45127247.

It is an arithmetic number, because the mean of its divisors is an integer number (60782775585).

Almost surely, 2^243040850537 is an apocalyptic number.

It is an amenable number.

243040850537 is a deficient number, since it is larger than the sum of its proper divisors (90251803).

243040850537 is an equidigital number, since it uses as much as digits as its factorization.

243040850537 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90251802.

The product of its (nonzero) digits is 403200, while the sum is 41.

Adding to 243040850537 its reverse (735058040342), we get a palindrome (978098890879).

The spelling of 243040850537 in words is "two hundred forty-three billion, forty million, eight hundred fifty thousand, five hundred thirty-seven".