9072145 has 4 divisors (see below), whose sum is σ = 10886580. Its totient is φ = 7257712.

The previous prime is 9072127. The next prime is 9072191. The reversal of 9072145 is 5412709.

It is a happy number.

It is a Cunningham number, because it is equal to 3012²+1.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5412709 = 313 ⋅17293.

It can be written as a sum of positive squares in 2 ways, for example, as 3268864 + 5803281 = 1808^2 + 2409^2 .

It is a cyclic number.

It is not a de Polignac number, because 9072145 - 2⁹ = 9071633 is a prime.

It is an alternating number because its digits alternate between odd and even.

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, 907210 + ... + 907219.

It is an arithmetic number, because the mean of its divisors is an integer number (2721645).

Almost surely, 2^9072145 is an apocalyptic number.

It is an amenable number.

9072145 is a deficient number, since it is larger than the sum of its proper divisors (1814435).

9072145 is a wasteful number, since it uses less digits than its factorization.

9072145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1814434.

The product of its (nonzero) digits is 2520, while the sum is 28.

The square root of 9072145 is about 3012.0001660027. Note that the first 3 decimals coincide. The cubic root of 9072145 is about 208.5627098510.

The spelling of 9072145 in words is "nine million, seventy-two thousand, one hundred forty-five".