23115217 has 4 divisors (see below), whose sum is σ = 23161140. Its totient is φ = 23069296.

The previous prime is 23115203. The next prime is 23115221. The reversal of 23115217 is 71251132.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 7623121 + 15492096 = 2761^2 + 3936^2 .

It is a cyclic number.

It is not a de Polignac number, because 23115217 - 2¹¹ = 23113169 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23115227) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22198 + ... + 23215.

It is an arithmetic number, because the mean of its divisors is an integer number (5790285).

Almost surely, 2^23115217 is an apocalyptic number.

It is an amenable number.

23115217 is a deficient number, since it is larger than the sum of its proper divisors (45923).

23115217 is an equidigital number, since it uses as much as digits as its factorization.

23115217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45922.

The product of its digits is 420, while the sum is 22.

The square root of 23115217 is about 4807.8287199109. The cubic root of 23115217 is about 284.8607794430.

Adding to 23115217 its reverse (71251132), we get a palindrome (94366349).

It can be divided in two parts, 23115 and 217, that added together give a palindrome (23332).

The spelling of 23115217 in words is "twenty-three million, one hundred fifteen thousand, two hundred seventeen".