111115391081 has 2 divisors, whose sum is σ = 111115391082. Its totient is φ = 111115391080.

The previous prime is 111115391069. The next prime is 111115391099. The reversal of 111115391081 is 180193511111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 108514901056 + 2600490025 = 329416^2 + 50995^2 .

It is a cyclic number.

It is not a de Polignac number, because 111115391081 - 2⁶ = 111115391017 is a prime.

It is a super-2 number, since 2×111115391081² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (111115391581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55557695540 + 55557695541.

It is an arithmetic number, because the mean of its divisors is an integer number (55557695541).

Almost surely, 2^111115391081 is an apocalyptic number.

It is an amenable number.

111115391081 is a deficient number, since it is larger than the sum of its proper divisors (1).

111115391081 is an equidigital number, since it uses as much as digits as its factorization.

111115391081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1080, while the sum is 32.

The spelling of 111115391081 in words is "one hundred eleven billion, one hundred fifteen million, three hundred ninety-one thousand, eighty-one".