123216513 has 16 divisors (see below), whose sum is σ = 187916160. Its totient is φ = 70350336.

The previous prime is 123216503. The next prime is 123216547. The reversal of 123216513 is 315612321.

It is not a de Polignac number, because 123216513 - 2¹⁰ = 123215489 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (123216503) 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, 40903 + ... + 43811.

It is an arithmetic number, because the mean of its divisors is an integer number (11744760).

Almost surely, 2^123216513 is an apocalyptic number.

It is an amenable number.

123216513 is a deficient number, since it is larger than the sum of its proper divisors (64699647).

123216513 is a wasteful number, since it uses less digits than its factorization.

123216513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4936.

The product of its digits is 1080, while the sum is 24.

The square root of 123216513 is about 11100.2933745014. The cubic root of 123216513 is about 497.6106172217.

Adding to 123216513 its reverse (315612321), we get a palindrome (438828834).

The spelling of 123216513 in words is "one hundred twenty-three million, two hundred sixteen thousand, five hundred thirteen".