243115025437 has 2 divisors, whose sum is σ = 243115025438. Its totient is φ = 243115025436.

The previous prime is 243115025303. The next prime is 243115025441. The reversal of 243115025437 is 734520511342.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 224643769156 + 18471256281 = 473966^2 + 135909^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-243115025437 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 243115025396 and 243115025405.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243115025497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121557512718 + 121557512719.

It is an arithmetic number, because the mean of its divisors is an integer number (121557512719).

Almost surely, 2^243115025437 is an apocalyptic number.

It is an amenable number.

243115025437 is a deficient number, since it is larger than the sum of its proper divisors (1).

243115025437 is an equidigital number, since it uses as much as digits as its factorization.

243115025437 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 100800, while the sum is 37.

Adding to 243115025437 its reverse (734520511342), we get a palindrome (977635536779).

The spelling of 243115025437 in words is "two hundred forty-three billion, one hundred fifteen million, twenty-five thousand, four hundred thirty-seven".