123689530121 has 4 divisors (see below), whose sum is σ = 130965384852. Its totient is φ = 116413675392.

The previous prime is 123689530117. The next prime is 123689530193. The reversal of 123689530121 is 121035986321.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 103825728400 + 19863801721 = 322220^2 + 140939^2 .

It is a cyclic number.

It is not a de Polignac number, because 123689530121 - 2² = 123689530117 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (123689535121) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3637927340 + ... + 3637927373.

It is an arithmetic number, because the mean of its divisors is an integer number (32741346213).

Almost surely, 2^123689530121 is an apocalyptic number.

It is an amenable number.

123689530121 is a deficient number, since it is larger than the sum of its proper divisors (7275854731).

123689530121 is an equidigital number, since it uses as much as digits as its factorization.

123689530121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7275854730.

The product of its (nonzero) digits is 77760, while the sum is 41.

The spelling of 123689530121 in words is "one hundred twenty-three billion, six hundred eighty-nine million, five hundred thirty thousand, one hundred twenty-one".