99421589 has 2 divisors, whose sum is σ = 99421590. Its totient is φ = 99421588.

The previous prime is 99421583. The next prime is 99421607. The reversal of 99421589 is 98512499.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 61105489 + 38316100 = 7817^2 + 6190^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-99421589 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is equal to p_5729978 and since 99421589 and 5729978 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 (99421583) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49710794 + 49710795.

It is an arithmetic number, because the mean of its divisors is an integer number (49710795).

Almost surely, 2^99421589 is an apocalyptic number.

It is an amenable number.

99421589 is a deficient number, since it is larger than the sum of its proper divisors (1).

99421589 is an equidigital number, since it uses as much as digits as its factorization.

99421589 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 233280, while the sum is 47.

The square root of 99421589 is about 9971.0375087049. The cubic root of 99421589 is about 463.2622370194.

The spelling of 99421589 in words is "ninety-nine million, four hundred twenty-one thousand, five hundred eighty-nine".