1236247297897 has 2 divisors, whose sum is σ = 1236247297898. Its totient is φ = 1236247297896.

The previous prime is 1236247297871. The next prime is 1236247297949. The reversal of 1236247297897 is 7987927426321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1235719033641 + 528264256 = 1111629^2 + 22984^2 .

It is an emirp because it is prime and its reverse (7987927426321) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1236247297897 - 2¹⁹ = 1236246773609 is a prime.

It is not a weakly prime, because it can be changed into another prime (1236247397897) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 618123648948 + 618123648949.

It is an arithmetic number, because the mean of its divisors is an integer number (618123648949).

Almost surely, 2^{1236247297897} is an apocalyptic number.

It is an amenable number.

1236247297897 is a deficient number, since it is larger than the sum of its proper divisors (1).

1236247297897 is an equidigital number, since it uses as much as digits as its factorization.

1236247297897 is an evil number, because the sum of its binary digits is even.

The product of its digits is 128024064, while the sum is 67.

The spelling of 1236247297897 in words is "one trillion, two hundred thirty-six billion, two hundred forty-seven million, two hundred ninety-seven thousand, eight hundred ninety-seven".