1231118617 has 2 divisors, whose sum is σ = 1231118618. Its totient is φ = 1231118616.

The previous prime is 1231118587. The next prime is 1231118621. The reversal of 1231118617 is 7168111321.

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., 835267801 + 395850816 = 28901^2 + 19896^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1231118617 is a prime.

It is a super-3 number, since 3×1231118617³ (a number of 28 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (1231118657) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 615559308 + 615559309.

It is an arithmetic number, because the mean of its divisors is an integer number (615559309).

Almost surely, 2^1231118617 is an apocalyptic number.

It is an amenable number.

1231118617 is a deficient number, since it is larger than the sum of its proper divisors (1).

1231118617 is an equidigital number, since it uses as much as digits as its factorization.

1231118617 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2016, while the sum is 31.

The square root of 1231118617 is about 35087.2999388668. The cubic root of 1231118617 is about 1071.7659768098.

Adding to 1231118617 its reverse (7168111321), we get a palindrome (8399229938).

The spelling of 1231118617 in words is "one billion, two hundred thirty-one million, one hundred eighteen thousand, six hundred seventeen".