123138591841 has 2 divisors, whose sum is σ = 123138591842. Its totient is φ = 123138591840.

The previous prime is 123138591803. The next prime is 123138591847. The reversal of 123138591841 is 148195831321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 69026527441 + 54112064400 = 262729^2 + 232620^2 .

It is a cyclic number.

It is not a de Polignac number, because 123138591841 - 2¹¹ = 123138589793 is a prime.

It is a super-2 number, since 2×123138591841² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 123138591791 and 123138591800.

It is not a weakly prime, because it can be changed into another prime (123138591847) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61569295920 + 61569295921.

It is an arithmetic number, because the mean of its divisors is an integer number (61569295921).

Almost surely, 2^123138591841 is an apocalyptic number.

It is an amenable number.

123138591841 is a deficient number, since it is larger than the sum of its proper divisors (1).

123138591841 is an equidigital number, since it uses as much as digits as its factorization.

123138591841 is an evil number, because the sum of its binary digits is even.

The product of its digits is 207360, while the sum is 46.

The spelling of 123138591841 in words is "one hundred twenty-three billion, one hundred thirty-eight million, five hundred ninety-one thousand, eight hundred forty-one".