89430821 has 2 divisors, whose sum is σ = 89430822. Its totient is φ = 89430820.

The previous prime is 89430797. The next prime is 89430823. The reversal of 89430821 is 12803498.

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., 67010596 + 22420225 = 8186^2 + 4735^2 .

It is a cyclic number.

It is not a de Polignac number, because 89430821 - 2¹⁰ = 89429797 is a prime.

Together with 89430823, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (89430823) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 44715410 + 44715411.

It is an arithmetic number, because the mean of its divisors is an integer number (44715411).

Almost surely, 2^89430821 is an apocalyptic number.

It is an amenable number.

89430821 is a deficient number, since it is larger than the sum of its proper divisors (1).

89430821 is an equidigital number, since it uses as much as digits as its factorization.

89430821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13824, while the sum is 35.

The square root of 89430821 is about 9456.7870336600. The cubic root of 89430821 is about 447.1937644539.

The spelling of 89430821 in words is "eighty-nine million, four hundred thirty thousand, eight hundred twenty-one".