243232319657 has 2 divisors, whose sum is σ = 243232319658. Its totient is φ = 243232319656.

The previous prime is 243232319647. The next prime is 243232319749. The reversal of 243232319657 is 756913232342.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 239765936281 + 3466383376 = 489659^2 + 58876^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-243232319657 is a prime.

It is a super-2 number, since 2×243232319657² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (243232319647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121616159828 + 121616159829.

It is an arithmetic number, because the mean of its divisors is an integer number (121616159829).

Almost surely, 2^243232319657 is an apocalyptic number.

It is an amenable number.

243232319657 is a deficient number, since it is larger than the sum of its proper divisors (1).

243232319657 is an equidigital number, since it uses as much as digits as its factorization.

243232319657 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1632960, while the sum is 47.

The spelling of 243232319657 in words is "two hundred forty-three billion, two hundred thirty-two million, three hundred nineteen thousand, six hundred fifty-seven".