9072521 has 4 divisors (see below), whose sum is σ = 9293844. Its totient is φ = 8851200.

The previous prime is 9072517. The next prime is 9072523. The reversal of 9072521 is 1252709.

9072521 is nontrivially palindromic in base 6.

9072521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1252709 = 37 ⋅33857.

It can be written as a sum of positive squares in 2 ways, for example, as 546121 + 8526400 = 739^2 + 2920^2 .

It is a cyclic number.

It is not a de Polignac number, because 9072521 - 2² = 9072517 is a prime.

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

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9072523) 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, 110600 + ... + 110681.

It is an arithmetic number, because the mean of its divisors is an integer number (2323461).

Almost surely, 2^9072521 is an apocalyptic number.

It is an amenable number.

9072521 is a deficient number, since it is larger than the sum of its proper divisors (221323).

9072521 is a wasteful number, since it uses less digits than its factorization.

9072521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 221322.

The product of its (nonzero) digits is 1260, while the sum is 26.

The square root of 9072521 is about 3012.0625823512. The cubic root of 9072521 is about 208.5655911430.

The spelling of 9072521 in words is "nine million, seventy-two thousand, five hundred twenty-one".