9625721 has 4 divisors (see below), whose sum is σ = 11000832. Its totient is φ = 8250612.

The previous prime is 9625703. The next prime is 9625729. The reversal of 9625721 is 1275269.

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.

It is a cyclic number.

It is not a de Polignac number, because 9625721 - 2⁶ = 9625657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9625729) 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, 687545 + ... + 687558.

It is an arithmetic number, because the mean of its divisors is an integer number (2750208).

Almost surely, 2^9625721 is an apocalyptic number.

It is an amenable number.

9625721 is a deficient number, since it is larger than the sum of its proper divisors (1375111).

9625721 is a wasteful number, since it uses less digits than its factorization.

9625721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1375110.

The product of its digits is 7560, while the sum is 32.

The square root of 9625721 is about 3102.5346089931. The cubic root of 9625721 is about 212.7213545783.

The spelling of 9625721 in words is "nine million, six hundred twenty-five thousand, seven hundred twenty-one".