123111000101 has 4 divisors (see below), whose sum is σ = 124200478092. Its totient is φ = 122021522112.

The previous prime is 123111000091. The next prime is 123111000149. The reversal of 123111000101 is 101000111321.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 62563015876 + 60547984225 = 250126^2 + 246065^2 .

It is a cyclic number.

It is not a de Polignac number, because 123111000101 - 2¹⁴ = 123110983717 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123111000601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 544738826 + ... + 544739051.

It is an arithmetic number, because the mean of its divisors is an integer number (31050119523).

Almost surely, 2^123111000101 is an apocalyptic number.

It is an amenable number.

123111000101 is a deficient number, since it is larger than the sum of its proper divisors (1089477991).

123111000101 is a wasteful number, since it uses less digits than its factorization.

123111000101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1089477990.

The product of its (nonzero) digits is 6, while the sum is 11.

Adding to 123111000101 its reverse (101000111321), we get a palindrome (224111111422).

The spelling of 123111000101 in words is "one hundred twenty-three billion, one hundred eleven million, one hundred one", and thus it is an aban number.