123138591847 has 2 divisors, whose sum is σ = 123138591848. Its totient is φ = 123138591846.

The previous prime is 123138591841. The next prime is 123138591853. The reversal of 123138591847 is 748195831321.

It is a balanced prime because it is at equal distance from previous prime (123138591841) and next prime (123138591853).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-123138591847 is a prime.

It is a super-2 number, since 2×123138591847² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 123138591794 and 123138591803.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123138591841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61569295923 + 61569295924.

It is an arithmetic number, because the mean of its divisors is an integer number (61569295924).

Almost surely, 2^123138591847 is an apocalyptic number.

123138591847 is a deficient number, since it is larger than the sum of its proper divisors (1).

123138591847 is an equidigital number, since it uses as much as digits as its factorization.

123138591847 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1451520, while the sum is 52.

The spelling of 123138591847 in words is "one hundred twenty-three billion, one hundred thirty-eight million, five hundred ninety-one thousand, eight hundred forty-seven".