9497721 has 4 divisors (see below), whose sum is σ = 12663632. Its totient is φ = 6331812.

The previous prime is 9497693. The next prime is 9497767. The reversal of 9497721 is 1277949.

9497721 is digitally balanced in base 2 and base 4, because in such bases 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 a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 9497721 - 2¹⁴ = 9481337 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 9497721.

It is not an unprimeable number, because it can be changed into a prime (9497771) 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, 1582951 + ... + 1582956.

It is an arithmetic number, because the mean of its divisors is an integer number (3165908).

Almost surely, 2^9497721 is an apocalyptic number.

It is an amenable number.

9497721 is a deficient number, since it is larger than the sum of its proper divisors (3165911).

9497721 is a wasteful number, since it uses less digits than its factorization.

9497721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3165910.

The product of its digits is 31752, while the sum is 39.

The square root of 9497721 is about 3081.8372766906. The cubic root of 9497721 is about 211.7742419952.

The spelling of 9497721 in words is "nine million, four hundred ninety-seven thousand, seven hundred twenty-one".