9025721 has 4 divisors (see below), whose sum is σ = 9064692. Its totient is φ = 8986752.

The previous prime is 9025693. The next prime is 9025727. The reversal of 9025721 is 1275209.

9025721 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.

It can be written as a sum of positive squares in 2 ways, for example, as 1297321 + 7728400 = 1139^2 + 2780^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9025721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9025727) 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, 19136 + ... + 19601.

It is an arithmetic number, because the mean of its divisors is an integer number (2266173).

Almost surely, 2^9025721 is an apocalyptic number.

It is an amenable number.

9025721 is a deficient number, since it is larger than the sum of its proper divisors (38971).

9025721 is a wasteful number, since it uses less digits than its factorization.

9025721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38970.

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

The square root of 9025721 is about 3004.2837748788. The cubic root of 9025721 is about 208.2063487843.

The spelling of 9025721 in words is "nine million, twenty-five thousand, seven hundred twenty-one".