1155115081 has 2 divisors, whose sum is σ = 1155115082. Its totient is φ = 1155115080.

The previous prime is 1155115079. The next prime is 1155115123. The reversal of 1155115081 is 1805115511.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 627953481 + 527161600 = 25059^2 + 22960^2 .

It is a cyclic number.

It is not a de Polignac number, because 1155115081 - 2¹ = 1155115079 is a prime.

It is a super-2 number, since 2×1155115081² = 2668581700707273122, which contains 22 as substring.

Together with 1155115079, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1155115001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 577557540 + 577557541.

It is an arithmetic number, because the mean of its divisors is an integer number (577557541).

Almost surely, 2^1155115081 is an apocalyptic number.

It is an amenable number.

1155115081 is a deficient number, since it is larger than the sum of its proper divisors (1).

1155115081 is an equidigital number, since it uses as much as digits as its factorization.

1155115081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1000, while the sum is 28.

The square root of 1155115081 is about 33986.9839938762. The cubic root of 1155115081 is about 1049.2405940563.

The spelling of 1155115081 in words is "one billion, one hundred fifty-five million, one hundred fifteen thousand, eighty-one".