1145206145 has 4 divisors (see below), whose sum is σ = 1374247380. Its totient is φ = 916164912.

The previous prime is 1145206093. The next prime is 1145206177. The reversal of 1145206145 is 5416025411.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5416025411 = 19 ⋅285053969.

It can be written as a sum of positive squares in 2 ways, for example, as 555639184 + 589566961 = 23572^2 + 24281^2 .

It is a cyclic number.

It is not a de Polignac number, because 1145206145 - 2⁶ = 1145206081 is a prime.

It is a super-2 number, since 2×1145206145² = 2622994229091522050, which contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

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, 114520610 + ... + 114520619.

It is an arithmetic number, because the mean of its divisors is an integer number (343561845).

Almost surely, 2^1145206145 is an apocalyptic number.

It is an amenable number.

1145206145 is a deficient number, since it is larger than the sum of its proper divisors (229041235).

1145206145 is an equidigital number, since it uses as much as digits as its factorization.

1145206145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 229041234.

The product of its (nonzero) digits is 4800, while the sum is 29.

The square root of 1145206145 is about 33840.8945655992. The cubic root of 1145206145 is about 1046.2317366931.

The spelling of 1145206145 in words is "one billion, one hundred forty-five million, two hundred six thousand, one hundred forty-five".