123315681 has 16 divisors (see below), whose sum is σ = 174700800. Its totient is φ = 77151888.

The previous prime is 123315679. The next prime is 123315697. The reversal of 123315681 is 186513321.

It is not a de Polignac number, because 123315681 - 2¹ = 123315679 is a prime.

It is a super-2 number, since 2×123315681² = 30413514360987522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (123315601) 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, 4011 + ... + 16208.

It is an arithmetic number, because the mean of its divisors is an integer number (10918800).

Almost surely, 2^123315681 is an apocalyptic number.

It is an amenable number.

123315681 is a deficient number, since it is larger than the sum of its proper divisors (51385119).

123315681 is a wasteful number, since it uses less digits than its factorization.

123315681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20348.

The product of its digits is 4320, while the sum is 30.

The square root of 123315681 is about 11104.7593850565. The cubic root of 123315681 is about 497.7440782754.

The spelling of 123315681 in words is "one hundred twenty-three million, three hundred fifteen thousand, six hundred eighty-one".