1230123109 has 2 divisors, whose sum is σ = 1230123110. Its totient is φ = 1230123108.

The previous prime is 1230123107. The next prime is 1230123119. The reversal of 1230123109 is 9013210321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1097066884 + 133056225 = 33122^2 + 11535^2 .

It is a cyclic number.

It is not a de Polignac number, because 1230123109 - 2¹ = 1230123107 is a prime.

Together with 1230123107, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 1230123109.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1230123107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 615061554 + 615061555.

It is an arithmetic number, because the mean of its divisors is an integer number (615061555).

Almost surely, 2^1230123109 is an apocalyptic number.

It is an amenable number.

1230123109 is a deficient number, since it is larger than the sum of its proper divisors (1).

1230123109 is an equidigital number, since it uses as much as digits as its factorization.

1230123109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 324, while the sum is 22.

The square root of 1230123109 is about 35073.1109113520. The cubic root of 1230123109 is about 1071.4770148568.

The spelling of 1230123109 in words is "one billion, two hundred thirty million, one hundred twenty-three thousand, one hundred nine".