243044031157 has 2 divisors, whose sum is σ = 243044031158. Its totient is φ = 243044031156.

The previous prime is 243044031143. The next prime is 243044031203. The reversal of 243044031157 is 751130440342.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 143060958756 + 99983072401 = 378234^2 + 316201^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-243044031157 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243044031107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121522015578 + 121522015579.

It is an arithmetic number, because the mean of its divisors is an integer number (121522015579).

Almost surely, 2^243044031157 is an apocalyptic number.

It is an amenable number.

243044031157 is a deficient number, since it is larger than the sum of its proper divisors (1).

243044031157 is an equidigital number, since it uses as much as digits as its factorization.

243044031157 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 40320, while the sum is 34.

Adding to 243044031157 its reverse (751130440342), we get a palindrome (994174471499).

The spelling of 243044031157 in words is "two hundred forty-three billion, forty-four million, thirty-one thousand, one hundred fifty-seven".