9189421 has 2 divisors, whose sum is σ = 9189422. Its totient is φ = 9189420.

The previous prime is 9189419. The next prime is 9189457. The reversal of 9189421 is 1249819.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6056521 + 3132900 = 2461^2 + 1770^2 .

It is an emirp because it is prime and its reverse (1249819) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9189421 - 2¹ = 9189419 is a prime.

Together with 9189419, it forms a pair of twin primes.

9189421 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9189461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4594710 + 4594711.

It is an arithmetic number, because the mean of its divisors is an integer number (4594711).

Almost surely, 2^9189421 is an apocalyptic number.

It is an amenable number.

9189421 is a deficient number, since it is larger than the sum of its proper divisors (1).

9189421 is an equidigital number, since it uses as much as digits as its factorization.

9189421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5184, while the sum is 34.

The square root of 9189421 is about 3031.4057795023. The cubic root of 9189421 is about 209.4575645562.

The spelling of 9189421 in words is "nine million, one hundred eighty-nine thousand, four hundred twenty-one".