9721541 has 4 divisors (see below), whose sum is σ = 9838752. Its totient is φ = 9604332.

The previous prime is 9721529. The next prime is 9721561. The reversal of 9721541 is 1451279.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1451279 = 257 ⋅5647.

It is a cyclic number.

It is not a de Polignac number, because 9721541 - 2⁶ = 9721477 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9721511) 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, 58481 + ... + 58646.

It is an arithmetic number, because the mean of its divisors is an integer number (2459688).

Almost surely, 2^9721541 is an apocalyptic number.

It is an amenable number.

9721541 is a deficient number, since it is larger than the sum of its proper divisors (117211).

9721541 is a wasteful number, since it uses less digits than its factorization.

9721541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117210.

The product of its digits is 2520, while the sum is 29.

The square root of 9721541 is about 3117.9385818197. The cubic root of 9721541 is about 213.4248758063.

The spelling of 9721541 in words is "nine million, seven hundred twenty-one thousand, five hundred forty-one".