123216287 has 4 divisors (see below), whose sum is σ = 124486656. Its totient is φ = 121945920.

The previous prime is 123216271. The next prime is 123216307. The reversal of 123216287 is 782612321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 782612321 = 4391 ⋅178231.

It is a cyclic number.

It is not a de Polignac number, because 123216287 - 2⁴ = 123216271 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 (123216487) 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, 635039 + ... + 635232.

It is an arithmetic number, because the mean of its divisors is an integer number (31121664).

Almost surely, 2^123216287 is an apocalyptic number.

123216287 is a deficient number, since it is larger than the sum of its proper divisors (1270369).

123216287 is an equidigital number, since it uses as much as digits as its factorization.

123216287 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1270368.

The product of its digits is 8064, while the sum is 32.

The square root of 123216287 is about 11100.2831945856. The cubic root of 123216287 is about 497.6103129874.

The spelling of 123216287 in words is "one hundred twenty-three million, two hundred sixteen thousand, two hundred eighty-seven".