11997517397 has 2 divisors, whose sum is σ = 11997517398. Its totient is φ = 11997517396.

The previous prime is 11997517391. The next prime is 11997517447. The reversal of 11997517397 is 79371579911.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11915687281 + 81830116 = 109159^2 + 9046^2 .

It is a cyclic number.

It is not a de Polignac number, because 11997517397 - 2¹⁶ = 11997451861 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11997517391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5998758698 + 5998758699.

It is an arithmetic number, because the mean of its divisors is an integer number (5998758699).

Almost surely, 2^11997517397 is an apocalyptic number.

It is an amenable number.

11997517397 is a deficient number, since it is larger than the sum of its proper divisors (1).

11997517397 is an equidigital number, since it uses as much as digits as its factorization.

11997517397 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3750705, while the sum is 59.

The spelling of 11997517397 in words is "eleven billion, nine hundred ninety-seven million, five hundred seventeen thousand, three hundred ninety-seven".