11100231997 has 2 divisors, whose sum is σ = 11100231998. Its totient is φ = 11100231996.

The previous prime is 11100231979. The next prime is 11100232051. The reversal of 11100231997 is 79913200111.

Together with previous prime (11100231979) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8658488601 + 2441743396 = 93051^2 + 49414^2 .

It is an emirp because it is prime and its reverse (79913200111) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 11100231997 - 2¹¹ = 11100229949 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11100231977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5550115998 + 5550115999.

It is an arithmetic number, because the mean of its divisors is an integer number (5550115999).

Almost surely, 2^11100231997 is an apocalyptic number.

It is an amenable number.

11100231997 is a deficient number, since it is larger than the sum of its proper divisors (1).

11100231997 is an equidigital number, since it uses as much as digits as its factorization.

11100231997 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3402, while the sum is 34.

The spelling of 11100231997 in words is "eleven billion, one hundred million, two hundred thirty-one thousand, nine hundred ninety-seven".