23121617 has 2 divisors, whose sum is σ = 23121618. Its totient is φ = 23121616.

The previous prime is 23121607. The next prime is 23121643. The reversal of 23121617 is 71612132.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21864976 + 1256641 = 4676^2 + 1121^2 .

It is a cyclic number.

It is not a de Polignac number, because 23121617 - 2⁸ = 23121361 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 23121592 and 23121601.

It is not a weakly prime, because it can be changed into another prime (23121607) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11560808 + 11560809.

It is an arithmetic number, because the mean of its divisors is an integer number (11560809).

Almost surely, 2^23121617 is an apocalyptic number.

It is an amenable number.

23121617 is a deficient number, since it is larger than the sum of its proper divisors (1).

23121617 is an equidigital number, since it uses as much as digits as its factorization.

23121617 is an evil number, because the sum of its binary digits is even.

The product of its digits is 504, while the sum is 23.

The square root of 23121617 is about 4808.4942549617. The cubic root of 23121617 is about 284.8870671875.

Adding to 23121617 its reverse (71612132), we get a palindrome (94733749).

The spelling of 23121617 in words is "twenty-three million, one hundred twenty-one thousand, six hundred seventeen".