1155161365 has 4 divisors (see below), whose sum is σ = 1386193644. Its totient is φ = 924129088.

The previous prime is 1155161327. The next prime is 1155161443. The reversal of 1155161365 is 5631615511.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5631615511 = 40609 ⋅138679.

It can be written as a sum of positive squares in 2 ways, for example, as 680531569 + 474629796 = 26087^2 + 21786^2 .

It is a cyclic number.

It is not a de Polignac number, because 1155161365 - 2¹⁷ = 1155030293 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1155161365.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 115516132 + ... + 115516141.

It is an arithmetic number, because the mean of its divisors is an integer number (346548411).

Almost surely, 2^1155161365 is an apocalyptic number.

It is an amenable number.

1155161365 is a deficient number, since it is larger than the sum of its proper divisors (231032279).

1155161365 is an equidigital number, since it uses as much as digits as its factorization.

1155161365 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 231032278.

The product of its digits is 13500, while the sum is 34.

The square root of 1155161365 is about 33987.6648947820. The cubic root of 1155161365 is about 1049.2546077835.

Adding to 1155161365 its reverse (5631615511), we get a palindrome (6786776876).

The spelling of 1155161365 in words is "one billion, one hundred fifty-five million, one hundred sixty-one thousand, three hundred sixty-five".