123229783681 has 3 divisors (see below), whose sum is σ = 123230134723. Its totient is φ = 123229432640.

The previous prime is 123229783673. The next prime is 123229783741. The reversal of 123229783681 is 186387922321.

It is a happy number.

The square root of 123229783681 is 351041.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 186387922321 = 719 ⋅259232159.

It can be written as a sum of positive squares in only one way, i.e., 103528854081 + 19700929600 = 321759^2 + 140360^2 .

It is not a de Polignac number, because 123229783681 - 2³ = 123229783673 is a prime.

It is a super-2 number, since 2×123229783681² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (123229783081) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 175521 + ... + 526561.

Almost surely, 2^123229783681 is an apocalyptic number.

123229783681 is the 351041-st square number.

123229783681 is the 175521-st centered octagonal number.

It is an amenable number.

123229783681 is a deficient number, since it is larger than the sum of its proper divisors (351042).

123229783681 is an frugal number, since it uses more digits than its factorization.

123229783681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 702082 (or 351041 counting only the distinct ones).

The product of its digits is 1741824, while the sum is 52.

The spelling of 123229783681 in words is "one hundred twenty-three billion, two hundred twenty-nine million, seven hundred eighty-three thousand, six hundred eighty-one".