9072161 has 4 divisors (see below), whose sum is σ = 10368192. Its totient is φ = 7776132.

The previous prime is 9072127. The next prime is 9072191. The reversal of 9072161 is 1612709.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1612709 = 7 ⋅230387.

It is not a de Polignac number, because 9072161 - 2¹⁰ = 9071137 is a prime.

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

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 9072161.

It is not an unprimeable number, because it can be changed into a prime (9072191) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 648005 + ... + 648018.

It is an arithmetic number, because the mean of its divisors is an integer number (2592048).

Almost surely, 2^9072161 is an apocalyptic number.

It is an amenable number.

9072161 is a deficient number, since it is larger than the sum of its proper divisors (1296031).

9072161 is a wasteful number, since it uses less digits than its factorization.

9072161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1296030.

The product of its (nonzero) digits is 756, while the sum is 26.

The square root of 9072161 is about 3012.0028220438. The cubic root of 9072161 is about 208.5628324608.

The spelling of 9072161 in words is "nine million, seventy-two thousand, one hundred sixty-one".