1089421 has 2 divisors, whose sum is σ = 1089422. Its totient is φ = 1089420.

The previous prime is 1089401. The next prime is 1089427. The reversal of 1089421 is 1249801.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 741321 + 348100 = 861^2 + 590^2 .

It is a cyclic number.

It is not a de Polignac number, because 1089421 - 2¹³ = 1081229 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1089427) 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 as a sum of consecutive naturals, namely, 544710 + 544711.

It is an arithmetic number, because the mean of its divisors is an integer number (544711).

2^1089421 is an apocalyptic number.

It is an amenable number.

1089421 is a deficient number, since it is larger than the sum of its proper divisors (1).

1089421 is an equidigital number, since it uses as much as digits as its factorization.

1089421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 576, while the sum is 25.

The square root of 1089421 is about 1043.7533233480. The cubic root of 1089421 is about 102.8960209988.

The spelling of 1089421 in words is "one million, eighty-nine thousand, four hundred twenty-one".