123072109 has 2 divisors, whose sum is σ = 123072110. Its totient is φ = 123072108.

The previous prime is 123072091. The next prime is 123072121. The reversal of 123072109 is 901270321.

Together with previous prime (123072091) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 70509609 + 52562500 = 8397^2 + 7250^2 .

It is a cyclic number.

It is not a de Polignac number, because 123072109 - 2⁷ = 123071981 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123070109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61536054 + 61536055.

It is an arithmetic number, because the mean of its divisors is an integer number (61536055).

Almost surely, 2^123072109 is an apocalyptic number.

It is an amenable number.

123072109 is a deficient number, since it is larger than the sum of its proper divisors (1).

123072109 is an equidigital number, since it uses as much as digits as its factorization.

123072109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 756, while the sum is 25.

The square root of 123072109 is about 11093.7869548680. The cubic root of 123072109 is about 497.4161490964.

The spelling of 123072109 in words is "one hundred twenty-three million, seventy-two thousand, one hundred nine".