9250721 has 4 divisors (see below), whose sum is σ = 9335700. Its totient is φ = 9165744.

The previous prime is 9250699. The next prime is 9250723. The reversal of 9250721 is 1270529.

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 7398400 + 1852321 = 2720^2 + 1361^2 .

It is a cyclic number.

It is not a de Polignac number, because 9250721 - 2²² = 5056417 is a prime.

It is a super-3 number, since 3×9250721³ (a number of 22 digits) contains 333 as substring.

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 (9250723) by changing a digit.

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, 42326 + ... + 42543.

It is an arithmetic number, because the mean of its divisors is an integer number (2333925).

Almost surely, 2^9250721 is an apocalyptic number.

It is an amenable number.

9250721 is a deficient number, since it is larger than the sum of its proper divisors (84979).

9250721 is a wasteful number, since it uses less digits than its factorization.

9250721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84978.

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

The square root of 9250721 is about 3041.4997945093. The cubic root of 9250721 is about 209.9222766038.

The spelling of 9250721 in words is "nine million, two hundred fifty thousand, seven hundred twenty-one".