123881447709 has 40 divisors (see below), whose sum is σ = 187696863992. Its totient is φ = 81410987520.

The previous prime is 123881447647. The next prime is 123881447713. The reversal of 123881447709 is 907744188321.

123881447709 is a `hidden beast` number, since 123 + 8 + 8 + 1 + 447 + 70 + 9 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 41584182084 + 82297265625 = 203922^2 + 286875^2 .

It is not a de Polignac number, because 123881447709 - 2¹¹ = 123881445661 is a prime.

It is a super-2 number, since 2×123881447709² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123881447759) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 13128057 + ... + 13137489.

Almost surely, 2^123881447709 is an apocalyptic number.

It is an amenable number.

123881447709 is a deficient number, since it is larger than the sum of its proper divisors (63815416283).

123881447709 is an equidigital number, since it uses as much as digits as its factorization.

123881447709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11739 (or 11730 counting only the distinct ones).

The product of its (nonzero) digits is 2709504, while the sum is 54.

The spelling of 123881447709 in words is "one hundred twenty-three billion, eight hundred eighty-one million, four hundred forty-seven thousand, seven hundred nine".