10123409909 has 2 divisors, whose sum is σ = 10123409910. Its totient is φ = 10123409908.

The previous prime is 10123409887. The next prime is 10123410029. The reversal of 10123409909 is 90990432101.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10123378225 + 31684 = 100615^2 + 178^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-10123409909 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10123402909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5061704954 + 5061704955.

It is an arithmetic number, because the mean of its divisors is an integer number (5061704955).

Almost surely, 2^10123409909 is an apocalyptic number.

It is an amenable number.

10123409909 is a deficient number, since it is larger than the sum of its proper divisors (1).

10123409909 is an equidigital number, since it uses as much as digits as its factorization.

10123409909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17496, while the sum is 38.

The spelling of 10123409909 in words is "ten billion, one hundred twenty-three million, four hundred nine thousand, nine hundred nine".