111345123509 has 2 divisors, whose sum is σ = 111345123510. Its totient is φ = 111345123508.

The previous prime is 111345123503. The next prime is 111345123523. The reversal of 111345123509 is 905321543111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 80843548900 + 30501574609 = 284330^2 + 174647^2 .

It is a cyclic number.

It is not a de Polignac number, because 111345123509 - 2¹⁶ = 111345057973 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111345123503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55672561754 + 55672561755.

It is an arithmetic number, because the mean of its divisors is an integer number (55672561755).

Almost surely, 2^111345123509 is an apocalyptic number.

It is an amenable number.

111345123509 is a deficient number, since it is larger than the sum of its proper divisors (1).

111345123509 is an equidigital number, since it uses as much as digits as its factorization.

111345123509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16200, while the sum is 35.

The spelling of 111345123509 in words is "one hundred eleven billion, three hundred forty-five million, one hundred twenty-three thousand, five hundred nine".