9681421 has 2 divisors, whose sum is σ = 9681422. Its totient is φ = 9681420.

The previous prime is 9681409. The next prime is 9681437. The reversal of 9681421 is 1241869.

It is a happy number.

9681421 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8940100 + 741321 = 2990^2 + 861^2 .

It is an emirp because it is prime and its reverse (1241869) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9681421 - 2¹⁷ = 9550349 is a prime.

It is a Chen prime.

It is equal to p₆₄₄₉₂₆ and since 9681421 and 644926 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9681401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4840710 + 4840711.

It is an arithmetic number, because the mean of its divisors is an integer number (4840711).

Almost surely, 2^9681421 is an apocalyptic number.

It is an amenable number.

9681421 is a deficient number, since it is larger than the sum of its proper divisors (1).

9681421 is an equidigital number, since it uses as much as digits as its factorization.

9681421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3456, while the sum is 31.

The square root of 9681421 is about 3111.4981921897. The cubic root of 9681421 is about 213.1308753608.

The spelling of 9681421 in words is "nine million, six hundred eighty-one thousand, four hundred twenty-one".