1161575145 has 12 divisors (see below), whose sum is σ = 2013396996. Its totient is φ = 619506720.

The previous prime is 1161575137. The next prime is 1161575153. The reversal of 1161575145 is 5415751611.

1161575145 is a `hidden beast` number, since 11 + 61 + 575 + 14 + 5 = 666.

1161575145 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (1161575137) and next prime (1161575153).

It can be written as a sum of positive squares in 2 ways, for example, as 251285904 + 910289241 = 15852^2 + 30171^2 .

It is not a de Polignac number, because 1161575145 - 2³ = 1161575137 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12906346 + ... + 12906435.

It is an arithmetic number, because the mean of its divisors is an integer number (167783083).

Almost surely, 2^1161575145 is an apocalyptic number.

1161575145 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1161575145 is a deficient number, since it is larger than the sum of its proper divisors (851821851).

1161575145 is a wasteful number, since it uses less digits than its factorization.

1161575145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25812792 (or 25812789 counting only the distinct ones).

The product of its digits is 21000, while the sum is 36.

The square root of 1161575145 is about 34081.8888120949. Note that the first 4 decimals coincide. The cubic root of 1161575145 is about 1051.1929434597.

The spelling of 1161575145 in words is "one billion, one hundred sixty-one million, five hundred seventy-five thousand, one hundred forty-five".