1155861017 has 2 divisors, whose sum is σ = 1155861018. Its totient is φ = 1155861016.

The previous prime is 1155861011. The next prime is 1155861023. The reversal of 1155861017 is 7101685511.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (1155861011) and next prime (1155861023).

It can be written as a sum of positive squares in only one way, i.e., 825930121 + 329930896 = 28739^2 + 18164^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1155861017 is a prime.

It is not a weakly prime, because it can be changed into another prime (1155861011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 577930508 + 577930509.

It is an arithmetic number, because the mean of its divisors is an integer number (577930509).

Almost surely, 2^1155861017 is an apocalyptic number.

It is an amenable number.

1155861017 is a deficient number, since it is larger than the sum of its proper divisors (1).

1155861017 is an equidigital number, since it uses as much as digits as its factorization.

1155861017 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8400, while the sum is 35.

The square root of 1155861017 is about 33997.9560709170. The cubic root of 1155861017 is about 1049.4664006827.

The spelling of 1155861017 in words is "one billion, one hundred fifty-five million, eight hundred sixty-one thousand, seventeen".