12110001997 has 2 divisors, whose sum is σ = 12110001998. Its totient is φ = 12110001996.

The previous prime is 12110001991. The next prime is 12110002001. The reversal of 12110001997 is 79910001121.

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., 10454244516 + 1655757481 = 102246^2 + 40691^2 .

It is an emirp because it is prime and its reverse (79910001121) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12110001997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12110001991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6055000998 + 6055000999.

It is an arithmetic number, because the mean of its divisors is an integer number (6055000999).

Almost surely, 2^12110001997 is an apocalyptic number.

It is an amenable number.

12110001997 is a deficient number, since it is larger than the sum of its proper divisors (1).

12110001997 is an equidigital number, since it uses as much as digits as its factorization.

12110001997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1134, while the sum is 31.

The spelling of 12110001997 in words is "twelve billion, one hundred ten million, one thousand, nine hundred ninety-seven".