9651421 has 16 divisors (see below), whose sum is σ = 10967040. Its totient is φ = 8477040.

The previous prime is 9651419. The next prime is 9651437. The reversal of 9651421 is 1241569.

9651421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

9651421 is a nontrivial binomial coefficient, being equal to C(4394, 2).

It is not a de Polignac number, because 9651421 - 2¹ = 9651419 is a prime.

It is a Smith number, since the sum of its digits (28) coincides with the sum of the digits of its prime factors.

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 9651421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9651401) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 50436 + ... + 50626.

It is an arithmetic number, because the mean of its divisors is an integer number (685440).

Almost surely, 2^9651421 is an apocalyptic number.

9651421 is the 4393-rd triangular number and also the 2197-th hexagonal number.

9651421 is the 1465-th centered nonagonal number.

It is an amenable number.

9651421 is a deficient number, since it is larger than the sum of its proper divisors (1315619).

9651421 is a wasteful number, since it uses less digits than its factorization.

9651421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 253 (or 227 counting only the distinct ones).

The product of its digits is 2160, while the sum is 28.

The square root of 9651421 is about 3106.6736230251. The cubic root of 9651421 is about 212.9105033727.

The spelling of 9651421 in words is "nine million, six hundred fifty-one thousand, four hundred twenty-one".