11112197917897 has 2 divisors, whose sum is σ = 11112197917898. Its totient is φ = 11112197917896.

The previous prime is 11112197917871. The next prime is 11112197917913. The reversal of 11112197917897 is 79871979121111.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9093698611776 + 2018499306121 = 3015576^2 + 1420739^2 .

It is an emirp because it is prime and its reverse (79871979121111) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 11112197917897 - 2¹¹ = 11112197915849 is a prime.

It is not a weakly prime, because it can be changed into another prime (11112197917817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5556098958948 + 5556098958949.

It is an arithmetic number, because the mean of its divisors is an integer number (5556098958949).

Almost surely, 2^{11112197917897} is an apocalyptic number.

It is an amenable number.

11112197917897 is a deficient number, since it is larger than the sum of its proper divisors (1).

11112197917897 is an equidigital number, since it uses as much as digits as its factorization.

11112197917897 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4000752, while the sum is 64.

The spelling of 11112197917897 in words is "eleven trillion, one hundred twelve billion, one hundred ninety-seven million, nine hundred seventeen thousand, eight hundred ninety-seven".