123512217 has 16 divisors (see below), whose sum is σ = 175445760. Its totient is φ = 77064912.

The previous prime is 123512197. The next prime is 123512219. The reversal of 123512217 is 712215321.

It is not a de Polignac number, because 123512217 - 2⁸ = 123511961 is a prime.

It is not an unprimeable number, because it can be changed into a prime (123512219) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8323 + ... + 17784.

It is an arithmetic number, because the mean of its divisors is an integer number (10965360).

Almost surely, 2^123512217 is an apocalyptic number.

It is an amenable number.

123512217 is a deficient number, since it is larger than the sum of its proper divisors (51933543).

123512217 is a wasteful number, since it uses less digits than its factorization.

123512217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26212.

The product of its digits is 840, while the sum is 24.

The square root of 123512217 is about 11113.6050406697. The cubic root of 123512217 is about 498.0083666600.

Adding to 123512217 its reverse (712215321), we get a palindrome (835727538).

The spelling of 123512217 in words is "one hundred twenty-three million, five hundred twelve thousand, two hundred seventeen".