1011111197 has 2 divisors, whose sum is σ = 1011111198. Its totient is φ = 1011111196.

The previous prime is 1011111149. The next prime is 1011111203. The reversal of 1011111197 is 7911111101.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 900840196 + 110271001 = 30014^2 + 10501^2 .

It is an emirp because it is prime and its reverse (7911111101) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1011111197 - 2⁶ = 1011111133 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1011111697) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 505555598 + 505555599.

It is an arithmetic number, because the mean of its divisors is an integer number (505555599).

Almost surely, 2^1011111197 is an apocalyptic number.

It is an amenable number.

1011111197 is a deficient number, since it is larger than the sum of its proper divisors (1).

1011111197 is an equidigital number, since it uses as much as digits as its factorization.

1011111197 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 63, while the sum is 23.

The square root of 1011111197 is about 31797.9747311051. The cubic root of 1011111197 is about 1003.6900987554.

Adding to 1011111197 its reverse (7911111101), we get a palindrome (8922222298).

The spelling of 1011111197 in words is "one billion, eleven million, one hundred eleven thousand, one hundred ninety-seven".