99221489 has 2 divisors, whose sum is σ = 99221490. Its totient is φ = 99221488.

The previous prime is 99221467. The next prime is 99221509. The reversal of 99221489 is 98412299.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 88981489 + 10240000 = 9433^2 + 3200^2 .

It is a cyclic number.

It is not a de Polignac number, because 99221489 - 2²⁴ = 82444273 is a prime.

It is not a weakly prime, because it can be changed into another prime (99221429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49610744 + 49610745.

It is an arithmetic number, because the mean of its divisors is an integer number (49610745).

Almost surely, 2^99221489 is an apocalyptic number.

It is an amenable number.

99221489 is a deficient number, since it is larger than the sum of its proper divisors (1).

99221489 is an equidigital number, since it uses as much as digits as its factorization.

99221489 is an evil number, because the sum of its binary digits is even.

The product of its digits is 93312, while the sum is 44.

The square root of 99221489 is about 9960.9983937354. The cubic root of 99221489 is about 462.9512347043.

It can be divided in two parts, 9922 and 1489, that added together give a palindrome (11411).

The spelling of 99221489 in words is "ninety-nine million, two hundred twenty-one thousand, four hundred eighty-nine".