1211231117 has 2 divisors, whose sum is σ = 1211231118. Its totient is φ = 1211231116.

The previous prime is 1211231093. The next prime is 1211231123. The reversal of 1211231117 is 7111321121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 986650921 + 224580196 = 31411^2 + 14986^2 .

It is a cyclic number.

It is not a de Polignac number, because 1211231117 - 2⁶ = 1211231053 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1211251117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605615558 + 605615559.

It is an arithmetic number, because the mean of its divisors is an integer number (605615559).

Almost surely, 2^1211231117 is an apocalyptic number.

It is an amenable number.

1211231117 is a deficient number, since it is larger than the sum of its proper divisors (1).

1211231117 is an equidigital number, since it uses as much as digits as its factorization.

1211231117 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 84, while the sum is 20.

The square root of 1211231117 is about 34802.7458255811. The cubic root of 1211231117 is about 1065.9635139994.

Adding to 1211231117 its reverse (7111321121), we get a palindrome (8322552238).

The spelling of 1211231117 in words is "one billion, two hundred eleven million, two hundred thirty-one thousand, one hundred seventeen".