1145385161 has 4 divisors (see below), whose sum is σ = 1145745300. Its totient is φ = 1145025024.

The previous prime is 1145385133. The next prime is 1145385193. The reversal of 1145385161 is 1615835411.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 398401600 + 746983561 = 19960^2 + 27331^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1145385161 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1145385961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 175256 + ... + 181673.

It is an arithmetic number, because the mean of its divisors is an integer number (286436325).

Almost surely, 2^1145385161 is an apocalyptic number.

It is an amenable number.

1145385161 is a deficient number, since it is larger than the sum of its proper divisors (360139).

1145385161 is an equidigital number, since it uses as much as digits as its factorization.

1145385161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 360138.

The product of its digits is 14400, while the sum is 35.

The square root of 1145385161 is about 33843.5394277844. The cubic root of 1145385161 is about 1046.2862487019.

The spelling of 1145385161 in words is "one billion, one hundred forty-five million, three hundred eighty-five thousand, one hundred sixty-one".