9661421 has 16 divisors (see below), whose sum is σ = 12115968. Its totient is φ = 7484400.

The previous prime is 9661417. The next prime is 9661439. The reversal of 9661421 is 1241669.

It is not a de Polignac number, because 9661421 - 2² = 9661417 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9661441) 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, 20636 + ... + 21098.

It is an arithmetic number, because the mean of its divisors is an integer number (757248).

Almost surely, 2^9661421 is an apocalyptic number.

It is an amenable number.

9661421 is a deficient number, since it is larger than the sum of its proper divisors (2454547).

9661421 is a wasteful number, since it uses less digits than its factorization.

9661421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 752.

The product of its digits is 2592, while the sum is 29.

The square root of 9661421 is about 3108.2826448056. The cubic root of 9661421 is about 212.9840113782.

The spelling of 9661421 in words is "nine million, six hundred sixty-one thousand, four hundred twenty-one".