111512345123 has 2 divisors, whose sum is σ = 111512345124. Its totient is φ = 111512345122.

The previous prime is 111512345023. The next prime is 111512345137. The reversal of 111512345123 is 321543215111.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 111512345123 - 2¹² = 111512341027 is a prime.

It is a super-2 number, since 2×111512345123² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (111512345023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55756172561 + 55756172562.

It is an arithmetic number, because the mean of its divisors is an integer number (55756172562).

Almost surely, 2^111512345123 is an apocalyptic number.

111512345123 is a deficient number, since it is larger than the sum of its proper divisors (1).

111512345123 is an equidigital number, since it uses as much as digits as its factorization.

111512345123 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3600, while the sum is 29.

The spelling of 111512345123 in words is "one hundred eleven billion, five hundred twelve million, three hundred forty-five thousand, one hundred twenty-three".