123870138247 has 2 divisors, whose sum is σ = 123870138248. Its totient is φ = 123870138246.

The previous prime is 123870138199. The next prime is 123870138269. The reversal of 123870138247 is 742831078321.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-123870138247 is a prime.

It is a super-2 number, since 2×123870138247² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 123870138197 and 123870138206.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123870138947) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61935069123 + 61935069124.

It is an arithmetic number, because the mean of its divisors is an integer number (61935069124).

Almost surely, 2^123870138247 is an apocalyptic number.

123870138247 is a deficient number, since it is larger than the sum of its proper divisors (1).

123870138247 is an equidigital number, since it uses as much as digits as its factorization.

123870138247 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 451584, while the sum is 46.

The spelling of 123870138247 in words is "one hundred twenty-three billion, eight hundred seventy million, one hundred thirty-eight thousand, two hundred forty-seven".