23117917 has 2 divisors, whose sum is σ = 23117918. Its totient is φ = 23117916.

The previous prime is 23117903. The next prime is 23117923. The reversal of 23117917 is 71971132.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20602521 + 2515396 = 4539^2 + 1586^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23117917 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23117417) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11558958 + 11558959.

It is an arithmetic number, because the mean of its divisors is an integer number (11558959).

Almost surely, 2^23117917 is an apocalyptic number.

It is an amenable number.

23117917 is a deficient number, since it is larger than the sum of its proper divisors (1).

23117917 is an equidigital number, since it uses as much as digits as its factorization.

23117917 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2646, while the sum is 31.

The square root of 23117917 is about 4808.1095037447. The cubic root of 23117917 is about 284.8718701769.

The spelling of 23117917 in words is "twenty-three million, one hundred seventeen thousand, nine hundred seventeen".