9721251 has 12 divisors (see below), whose sum is σ = 14068912. Its totient is φ = 6468336.

The previous prime is 9721247. The next prime is 9721273. The reversal of 9721251 is 1521279.

It is not a de Polignac number, because 9721251 - 2² = 9721247 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9721241) 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 11 ways as a sum of consecutive naturals, for example, 8145 + ... + 9261.

Almost surely, 2^9721251 is an apocalyptic number.

9721251 is a deficient number, since it is larger than the sum of its proper divisors (4347661).

9721251 is a wasteful number, since it uses less digits than its factorization.

9721251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2090 (or 2087 counting only the distinct ones).

The product of its digits is 1260, while the sum is 27.

The square root of 9721251 is about 3117.8920763875. The cubic root of 9721251 is about 213.4227535835.

The spelling of 9721251 in words is "nine million, seven hundred twenty-one thousand, two hundred fifty-one".