243322553197 has 2 divisors, whose sum is σ = 243322553198. Its totient is φ = 243322553196.

The previous prime is 243322553141. The next prime is 243322553311. The reversal of 243322553197 is 791355223342.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 236365158276 + 6957394921 = 486174^2 + 83411^2 .

It is a cyclic number.

It is not a de Polignac number, because 243322553197 - 2²⁷ = 243188335469 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243322553597) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121661276598 + 121661276599.

It is an arithmetic number, because the mean of its divisors is an integer number (121661276599).

Almost surely, 2^243322553197 is an apocalyptic number.

It is an amenable number.

243322553197 is a deficient number, since it is larger than the sum of its proper divisors (1).

243322553197 is an equidigital number, since it uses as much as digits as its factorization.

243322553197 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1360800, while the sum is 46.

The spelling of 243322553197 in words is "two hundred forty-three billion, three hundred twenty-two million, five hundred fifty-three thousand, one hundred ninety-seven".