100123012109 has 2 divisors, whose sum is σ = 100123012110. Its totient is φ = 100123012108.

The previous prime is 100123012081. The next prime is 100123012159. The reversal of 100123012109 is 901210321001.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 99905302084 + 217710025 = 316078^2 + 14755^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-100123012109 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (100123012159) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50061506054 + 50061506055.

It is an arithmetic number, because the mean of its divisors is an integer number (50061506055).

Almost surely, 2^100123012109 is an apocalyptic number.

It is an amenable number.

100123012109 is a deficient number, since it is larger than the sum of its proper divisors (1).

100123012109 is an equidigital number, since it uses as much as digits as its factorization.

100123012109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 108, while the sum is 20.

The spelling of 100123012109 in words is "one hundred billion, one hundred twenty-three million, twelve thousand, one hundred nine".