231216617 has 2 divisors, whose sum is σ = 231216618. Its totient is φ = 231216616.

The previous prime is 231216611. The next prime is 231216649. The reversal of 231216617 is 716612132.

231216617 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 223173721 + 8042896 = 14939^2 + 2836^2 .

It is a cyclic number.

It is not a de Polignac number, because 231216617 - 2⁸ = 231216361 is a prime.

It is a super-2 number, since 2×231216617² = 106922247953849378, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 231216617.

It is not a weakly prime, because it can be changed into another prime (231216611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115608308 + 115608309.

It is an arithmetic number, because the mean of its divisors is an integer number (115608309).

Almost surely, 2^231216617 is an apocalyptic number.

It is an amenable number.

231216617 is a deficient number, since it is larger than the sum of its proper divisors (1).

231216617 is an equidigital number, since it uses as much as digits as its factorization.

231216617 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3024, while the sum is 29.

The square root of 231216617 is about 15205.8086598510. The cubic root of 231216617 is about 613.7709758152.

Adding to 231216617 its reverse (716612132), we get a palindrome (947828749).

The spelling of 231216617 in words is "two hundred thirty-one million, two hundred sixteen thousand, six hundred seventeen".