9721631 has 16 divisors (see below), whose sum is σ = 10499328. Its totient is φ = 8985600.

The previous prime is 9721609. The next prime is 9721643. The reversal of 9721631 is 1361279.

It is a cyclic number.

It is not a de Polignac number, because 9721631 - 2¹⁴ = 9705247 is a prime.

It is a super-2 number, since 2×9721631² = 189020218600322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 9721594 and 9721603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9721031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 100175 + ... + 100271.

It is an arithmetic number, because the mean of its divisors is an integer number (656208).

Almost surely, 2^9721631 is an apocalyptic number.

9721631 is a deficient number, since it is larger than the sum of its proper divisors (777697).

9721631 is a wasteful number, since it uses less digits than its factorization.

9721631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 242.

The product of its digits is 2268, while the sum is 29.

The square root of 9721631 is about 3117.9530143990. The cubic root of 9721631 is about 213.4255344186.

It can be divided in two parts, 97216 and 31, that multiplied together give a square (3013696 = 1736²).

The spelling of 9721631 in words is "nine million, seven hundred twenty-one thousand, six hundred thirty-one".