9721057 has 8 divisors (see below), whose sum is σ = 10025856. Its totient is φ = 9420432.

The previous prime is 9721039. The next prime is 9721067. The reversal of 9721057 is 7501279.

9721057 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 9721057 - 2²³ = 1332449 is a prime.

It is a Duffinian number.

9721057 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (9721067) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4063 + ... + 5995.

It is an arithmetic number, because the mean of its divisors is an integer number (1253232).

Almost surely, 2^9721057 is an apocalyptic number.

It is an amenable number.

9721057 is a deficient number, since it is larger than the sum of its proper divisors (304799).

9721057 is a wasteful number, since it uses less digits than its factorization.

9721057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2087.

The product of its (nonzero) digits is 4410, while the sum is 31.

The square root of 9721057 is about 3117.8609654698. The cubic root of 9721057 is about 213.4213338660.

The spelling of 9721057 in words is "nine million, seven hundred twenty-one thousand, fifty-seven".