123671681 has 8 divisors (see below), whose sum is σ = 142371840. Its totient is φ = 105229728.

The previous prime is 123671677. The next prime is 123671693. The reversal of 123671681 is 186176321.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 123671681 - 2² = 123671677 is a prime.

It is a super-2 number, since 2×123671681² = 30589369362731522, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (123671081) 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 7 ways as a sum of consecutive naturals, for example, 63521 + ... + 65438.

It is an arithmetic number, because the mean of its divisors is an integer number (17796480).

Almost surely, 2^123671681 is an apocalyptic number.

It is an amenable number.

123671681 is a deficient number, since it is larger than the sum of its proper divisors (18700159).

123671681 is a wasteful number, since it uses less digits than its factorization.

123671681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129103.

The product of its digits is 12096, while the sum is 35.

The square root of 123671681 is about 11120.7769962355. The cubic root of 123671681 is about 498.2225971651. Note that the first 3 decimals are identical.

The spelling of 123671681 in words is "one hundred twenty-three million, six hundred seventy-one thousand, six hundred eighty-one".