1155665171 has 2 divisors, whose sum is σ = 1155665172. Its totient is φ = 1155665170.

The previous prime is 1155665149. The next prime is 1155665179. The reversal of 1155665171 is 1715665511.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1155665171 - 2²⁶ = 1088556307 is a prime.

It is not a weakly prime, because it can be changed into another prime (1155665179) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 577832585 + 577832586.

It is an arithmetic number, because the mean of its divisors is an integer number (577832586).

Almost surely, 2^1155665171 is an apocalyptic number.

1155665171 is a deficient number, since it is larger than the sum of its proper divisors (1).

1155665171 is an equidigital number, since it uses as much as digits as its factorization.

1155665171 is an evil number, because the sum of its binary digits is even.

The product of its digits is 31500, while the sum is 38.

The square root of 1155665171 is about 33995.0756875169. The cubic root of 1155665171 is about 1049.4071244078.

The spelling of 1155665171 in words is "one billion, one hundred fifty-five million, six hundred sixty-five thousand, one hundred seventy-one".