1155911017 has 2 divisors, whose sum is σ = 1155911018. Its totient is φ = 1155911016.

The previous prime is 1155910979. The next prime is 1155911047. The reversal of 1155911017 is 7101195511.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 831514896 + 324396121 = 28836^2 + 18011^2 .

It is a cyclic number.

It is not a de Polignac number, because 1155911017 - 2¹⁵ = 1155878249 is a prime.

It is a super-3 number, since 3×1155911017³ (a number of 28 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a self number, because there is not a number n which added to its sum of digits gives 1155911017.

It is not a weakly prime, because it can be changed into another prime (1155911047) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 577955508 + 577955509.

It is an arithmetic number, because the mean of its divisors is an integer number (577955509).

Almost surely, 2^1155911017 is an apocalyptic number.

It is an amenable number.

1155911017 is a deficient number, since it is larger than the sum of its proper divisors (1).

1155911017 is an equidigital number, since it uses as much as digits as its factorization.

1155911017 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1575, while the sum is 31.

The square root of 1155911017 is about 33998.6914012878. The cubic root of 1155911017 is about 1049.4815329990.

The spelling of 1155911017 in words is "one billion, one hundred fifty-five million, nine hundred eleven thousand, seventeen".