123211564 has 12 divisors (see below), whose sum is σ = 246423184. Its totient is φ = 52804944.

The previous prime is 123211549. The next prime is 123211567. The reversal of 123211564 is 465112321.

It is a happy number.

123211564 is an admirable number.

It is a hoax number, since the sum of its digits (25) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (123211567) 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, 2200179 + ... + 2200234.

Almost surely, 2^123211564 is an apocalyptic number.

123211564 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

123211564 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

123211564 is a wasteful number, since it uses less digits than its factorization.

123211564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4400424 (or 4400422 counting only the distinct ones).

The product of its digits is 1440, while the sum is 25.

The square root of 123211564 is about 11100.0704502269. The cubic root of 123211564 is about 497.6039549439.

Adding to 123211564 its reverse (465112321), we get a palindrome (588323885).

The spelling of 123211564 in words is "one hundred twenty-three million, two hundred eleven thousand, five hundred sixty-four".