123130320109 has 2 divisors, whose sum is σ = 123130320110. Its totient is φ = 123130320108.

The previous prime is 123130320101. The next prime is 123130320143. The reversal of 123130320109 is 901023031321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 91418546025 + 31711774084 = 302355^2 + 178078^2 .

It is a cyclic number.

It is not a de Polignac number, because 123130320109 - 2³ = 123130320101 is a prime.

It is a super-2 number, since 2×123130320109² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123130320101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61565160054 + 61565160055.

It is an arithmetic number, because the mean of its divisors is an integer number (61565160055).

Almost surely, 2^123130320109 is an apocalyptic number.

It is an amenable number.

123130320109 is a deficient number, since it is larger than the sum of its proper divisors (1).

123130320109 is an equidigital number, since it uses as much as digits as its factorization.

123130320109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 972, while the sum is 25.

The spelling of 123130320109 in words is "one hundred twenty-three billion, one hundred thirty million, three hundred twenty thousand, one hundred nine".