23172917 has 4 divisors (see below), whose sum is σ = 23187660. Its totient is φ = 23158176.

The previous prime is 23172911. The next prime is 23172923. The reversal of 23172917 is 71927132.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (23172911) and next prime (23172923).

It can be written as a sum of positive squares in 2 ways, for example, as 12453841 + 10719076 = 3529^2 + 3274^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23172917 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23172911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4688 + ... + 8265.

It is an arithmetic number, because the mean of its divisors is an integer number (5796915).

Almost surely, 2^23172917 is an apocalyptic number.

It is an amenable number.

23172917 is a deficient number, since it is larger than the sum of its proper divisors (14743).

23172917 is a wasteful number, since it uses less digits than its factorization.

23172917 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14742.

The product of its digits is 5292, while the sum is 32.

The square root of 23172917 is about 4813.8256096373. The cubic root of 23172917 is about 285.0976048168.

It can be divided in two parts, 231729 and 17, that multiplied together give a palindrome (3939393).

The spelling of 23172917 in words is "twenty-three million, one hundred seventy-two thousand, nine hundred seventeen".