123407775531 has 8 divisors (see below), whose sum is σ = 182826334160. Its totient is φ = 82271850336.

The previous prime is 123407775509. The next prime is 123407775581. The reversal of 123407775531 is 135577704321.

123407775531 is a `hidden beast` number, since 1 + 2 + 3 + 40 + 7 + 7 + 75 + 531 = 666.

It is not a de Polignac number, because 123407775531 - 2⁶ = 123407775467 is a prime.

It is a super-2 number, since 2×123407775531² (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 (123407775581) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2285329150 + ... + 2285329203.

It is an arithmetic number, because the mean of its divisors is an integer number (22853291770).

Almost surely, 2^123407775531 is an apocalyptic number.

123407775531 is a deficient number, since it is larger than the sum of its proper divisors (59418558629).

123407775531 is an equidigital number, since it uses as much as digits as its factorization.

123407775531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4570658362 (or 4570658356 counting only the distinct ones).

The product of its (nonzero) digits is 617400, while the sum is 45.

The spelling of 123407775531 in words is "one hundred twenty-three billion, four hundred seven million, seven hundred seventy-five thousand, five hundred thirty-one".