123164681 has 4 divisors (see below), whose sum is σ = 123305364. Its totient is φ = 123024000.

The previous prime is 123164663. The next prime is 123164719. The reversal of 123164681 is 186461321.

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 54523456 + 68641225 = 7384^2 + 8285^2 .

It is a cyclic number.

It is not a de Polignac number, because 123164681 - 2⁶ = 123164617 is a prime.

It is a super-4 number, since 4×123164681⁴ (a number of 33 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (123164611) 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, 69020 + ... + 70781.

It is an arithmetic number, because the mean of its divisors is an integer number (30826341).

Almost surely, 2^123164681 is an apocalyptic number.

It is an amenable number.

123164681 is a deficient number, since it is larger than the sum of its proper divisors (140683).

123164681 is an equidigital number, since it uses as much as digits as its factorization.

123164681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140682.

The product of its digits is 6912, while the sum is 32.

The square root of 123164681 is about 11097.9584158529. The cubic root of 123164681 is about 497.5408328227.

The spelling of 123164681 in words is "one hundred twenty-three million, one hundred sixty-four thousand, six hundred eighty-one".