111271997 has 2 divisors, whose sum is σ = 111271998. Its totient is φ = 111271996.

The previous prime is 111271967. The next prime is 111272011. The reversal of 111271997 is 799172111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 85729081 + 25542916 = 9259^2 + 5054^2 .

It is a cyclic number.

It is not a de Polignac number, because 111271997 - 2¹² = 111267901 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 111271997.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111271957) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55635998 + 55635999.

It is an arithmetic number, because the mean of its divisors is an integer number (55635999).

Almost surely, 2^111271997 is an apocalyptic number.

It is an amenable number.

111271997 is a deficient number, since it is larger than the sum of its proper divisors (1).

111271997 is an equidigital number, since it uses as much as digits as its factorization.

111271997 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7938, while the sum is 38.

The square root of 111271997 is about 10548.5542611298. The cubic root of 111271997 is about 480.9817824685.

The spelling of 111271997 in words is "one hundred eleven million, two hundred seventy-one thousand, nine hundred ninety-seven".