123111443969 has 2 divisors, whose sum is σ = 123111443970. Its totient is φ = 123111443968.

The previous prime is 123111443957. The next prime is 123111444007. The reversal of 123111443969 is 969344111321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 112367084944 + 10744359025 = 335212^2 + 103655^2 .

It is a cyclic number.

It is not a de Polignac number, because 123111443969 - 2²⁴ = 123094666753 is a prime.

It is a super-2 number, since 2×123111443969² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (123111443569) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61555721984 + 61555721985.

It is an arithmetic number, because the mean of its divisors is an integer number (61555721985).

Almost surely, 2^123111443969 is an apocalyptic number.

It is an amenable number.

123111443969 is a deficient number, since it is larger than the sum of its proper divisors (1).

123111443969 is an equidigital number, since it uses as much as digits as its factorization.

123111443969 is an evil number, because the sum of its binary digits is even.

The product of its digits is 139968, while the sum is 44.

The spelling of 123111443969 in words is "one hundred twenty-three billion, one hundred eleven million, four hundred forty-three thousand, nine hundred sixty-nine".